UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K ~~Current~~CURRENT ~~Report~~REPORT Pursuant Toto Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): ~~April~~September 2627, 2004 (Date of earliest event reported) Greenwich Capital Acceptance, Inc., (as depositor, ~~and~~under ~~Deutsche~~the ~~Bank National~~ Trust ~~Company~~Agreement, dated as ~~Trustee).~~October ~~WASHINGTON~~1, ~~MUTUAL~~2003, ~~MORT~~providing PSfor ~~THR~~the ~~CERTS~~issuance ~~SER~~of Washington Mutual Mortgage Trust Mortgage Pass-Through Certificates, Series 2003-R1) (Exact name of Registrant as specified in its Charter) DELAWARE (State or Other Jurisdiction of Incorporation) 333-108195-05 06-1199884 (Commission File Number) (I.R.S. Employer Identification No.) 600 Steamboat Road Greenwich, Connecticut 06830 (Address of principal executive offices) (Zip Code) Registrant's Telephone Number, Including Area Code: (203) 662-2700 ~~Item~~(Former 5name or former address, if changed since last report.) ~~Other~~Check ~~Events~~the ~~Attached~~appropriate ~~hereto~~box below if the Form 8-K filing is aintended ~~copy~~to simultaneously satisfy the filing obligation of the ~~Underlying~~registrant ~~Distribution~~under ~~Statement~~any toof the ~~Certificateholders~~following ~~which~~provisions ~~was~~(see ~~derived~~General ~~from~~Instruction A.2. below): [ ] Written communications pursuant to Rule 425 under the ~~monthly~~Securities ~~information~~Act ~~submitted~~(17 byCFR 230.425) [ ] Soliciting material pursuant to Rule 14a-12(b) under the ~~Master~~Exchange ~~Servicer~~Act of(17 CFR 240.14a-12(b)) [ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the ~~Underlying~~Exchange ~~Security~~Act (17 CFR 240.14d-2(b)) [ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the ~~Trustee~~Exchange Act (17 CFR 240.13e-4(c)) Item 78.01 Other Events. This current report on Form 8-K relates to the monthly distribution reported to the holders of Washington Mutual Mortgage Trust Mortgage Pass-Through Certificates, Series 2003-R1, which was made on October 1, 2003 Item 9.01 Financial ~~Statement~~Statements and Exhibits. ~~Exhibits:~~ (asc) ~~noted~~Exhibits inExhibit ~~Item~~No. 5Description ~~above)~~99.1 Monthly Remittance Statement to the Certificateholders dated as of ~~April~~September 2627, 2004. ~~SIGNATURE~~SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on ~~its~~ behalf of the Registrant by the undersigned, ~~hereunto~~thereunto duly authorized. ~~Deutsche~~DEUTSCHE ~~Bank~~BANK ~~National~~NATIONAL ~~Trust~~TRUST ~~Company~~COMPANY, ~~not~~IN inITS ~~its~~CAPACITY ~~individual~~AS ~~capacity,~~TRUSTEE ~~but~~UNDER ~~solely~~THE asTRUST aAGREEMENT ~~duly~~ON ~~authorized~~BEHALF ~~agent~~OF ofGREENWICH ~~the~~CAPITAL ~~Registrant pursuant to the Trust Agreement~~ACCEPTANCE, ~~dated as of October 1,2003~~INC., REGISTRANT Date: ~~Apr~~Sep 2627, 2004 By: /s/ Katherine M. Wannenmacher Katherine M. Wannenmacher Vice President EXHIBIT INDEX DOCUMENT 99.1 Monthly Remittance Statement to the Certificateholders dated as of ~~April~~September 2627, 2004.

	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	April 26, 2004 Distribution
	September 27, 2004 Distribution
	Contents
			TABLE OF CONTENTS
								Page
			1.	Contents				1
			2.	Certificate Payment Report				2
			3.	Collection Account Report				8
			4.	Credit Enhancement Report				11
			5.	Collateral Report				12
			6.	Delinquency Report				15
			7.	REO Report				16
			8.	Prepayment Report				17
			9.	Realized Loss Report				20
			10.	Realized Loss Detail Report				23
			11.	Additional Certificate Report				24
				Total Number of Pages				24
			CONTACTS
				Administrator: Alan Sueda
				Direct Phone Number: (714)247-6315
				Address: Deutsche Bank
				1761 E. St. Andrew Place, Santa Ana, CA 92705
				Web Site: https://www.corporatetrust.db.com/invr
				Factor Information: (800) 735-7777
				Main Phone Number: (714) 247-6000
ISSUANCE INFORMATION
	Seller:		Washington Mutual Bank					Cut-Off Date: March 1, 2000
	Certificate Insurer(s):							Closing Date: March 31, 2000
								First Payment Date: April 25, 2000
	Servicer(s):		Washington Mutual Master Servicer
								Distribution Date: April 26, 2004
								Distribution Date: September 27, 2004
	Underwriter(s):		Lehman Brothers Underwriter					Record Date: ~~April~~September 2324, 2004
								March 31, 2004
								August 31, 2004
						Page 1 of 24					© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Lower Tier REMIC Series 2000-1
	Certificate Payment Report for April 26, 2004 Distribution
	Certificate Payment Report for September 27, 2004 Distribution
	Distribution in Dollars - Current Period
					Prior						Current
	Class	Original			Principal			Total	Realized	Deferred	Principal
Class	Type	Face Value			Balance	Interest	Principal	Distribution	Losses	Interest	Balance
					(1)	(2)	(3)	(4)=(2)+(3)	(5)	(6)	(7)=(1)-(3)-(5)+(6)
LT-A1		4,799,976,000.00			-	-	-	-	-	-	-
LT-A2		1,599,992,000.00			1,~~247~~072,~~753~~558,~~150~~909.9963	43,~~295~~590,~~844~~928.8389	3527,~~751~~980,~~627~~520.0070	4031,~~047~~571,~~471~~449.8359	-	-	1,~~212~~044,~~001~~578,~~523~~388.9993
LT-M1		100,523,000.00			4135,~~134~~359,~~719~~084.2693	~~141~~118,~~621~~382.2627	1922,~~178,625~~434.0775	1,~~320~~040,~~246~~817.3302	-	-	3934,~~956~~436,~~094~~650.2018
LT-M2		83,769,000.00			3429,~~278~~465,~~932~~904.7211	~~118~~98,~~017~~651.7289	~~982~~768,~~187~~695.5662	1867,~~100,205~~347.2851	-	-	3328,~~296~~697,~~745~~208.1649
LT-M3		33,508,000.00			1311,~~711~~786,~~573~~361.0964	4739,~~207~~460.0976	~~392~~307,~~875~~478.0225	~~440~~346,~~082~~939.1101	-	-	1311,~~318~~478,~~698~~883.0739
LT-B1		40,209,000.00			149,~~174~~361,~~063~~034.3877	4831,~~799~~340.3876	~~982~~768,~~187~~695.5662	1800,~~030,986~~036.9438	-	-	138,~~191~~592,~~875~~339.8215
LT-B2		23,455,000.00			142,848.74	~~491~~478.8126	-	~~491~~478.8126	-	-	142,848.74
LT-B3		20,104,869.34			19,962,020.60	6866,~~726~~832.5388	-	6866,~~726~~832.5388	-	-	19,962,020.60
LT-R		-			-	-	-	-	-	-	-
Total		6,701,536,869.34			1,~~371~~178,~~157~~636,~~308~~164.7843	43,~~720~~946,~~708~~075.6271	3930,~~287~~747,~~502~~824.2095	4434,~~008~~693,~~210~~900.8266	-	-	1,~~331~~147,~~869~~888,~~806~~339.5848
	Interest Accrual Detail				Current Period Factor Information per $1,000 of Original Face
						Orig. Principal	Prior				Current
	Period	Period				(with Notional)	Principal			Total	Principal
Class	Starting	Ending		Method	Cusip	Balance	Balance	Interest	Principal	Distribution	Balance
							(1)	(2)	(3)	(4)=(2)+(3)	(5)
LT-A1				F-30/360		4,799,976,000.00	-	-	-	-	-
LT-A2				F-30/360		1,599,992,000.00	~~779~~670.~~849619~~352670	2.~~684916~~244342	2217.~~344879~~487913	2519.~~029795~~732255	~~757~~652.~~504740~~864757
LT-M1				F-30/360		100,523,000.00	~~409~~351.~~207040~~751191	1.~~408844~~177664	119.~~724929~~176355	1310.~~133774~~354019	~~397~~342.~~482111~~574835
LT-M2				F-30/360		83,769,000.00	~~409~~351.~~207854~~751890	1.~~408847~~177666	119.~~724953~~176373	1310.~~133800~~354039	~~397~~342.~~482901~~575517
LT-M3				F-30/360		33,508,000.00	~~409~~351.~~202969~~747691	1.~~408830~~177652	119.~~724813~~176264	1310.~~133643~~353916	~~397~~342.~~478156~~571428
LT-B1				F-30/360		40,209,000.00	~~352~~232.~~509721~~809440	10.~~213643~~779446	2419.~~427057~~117502	2519.~~640701~~896948	~~328~~213.~~082664~~691938
LT-B2				F-30/360		23,455,000.00	6.090332	0.~~020968~~020391	-	0.~~020968~~020391	6.090332
LT-B3				F-30/360		20,104,869.34	992.894819	3.~~418402~~324214	-	3.~~418402~~324214	992.894819
LT-R				F-30/360		-	-	-	-	-	-
							Page 2 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Lower Tier REMIC Series 2000-1
	Certificate Payment Report for April 26, 2004 Distribution
	Certificate Payment Report for September 27, 2004 Distribution
	Distribution in Dollars - to Date
											Current
	Original				Unscheduled	Scheduled	Total	Total	Realized	Deferred	Principal
Class	Face Value		Interest		Principal	Principal	Principal	Distribution	Losses	Interest	Balance
	(1)		(2)		(3)	(4)	(5)=(3)+(4)	(6)=(2)+(5)	(7)	(8)	(9)=(1)-(5)-(7)+(8)
LT-A1	4,799,976,000.00		535,861,077.70		4,620,338,847.23	179,637,152.77	4,799,976,000.00	5,335,837,077.70	-	-	-
LT-A2	1,599,992,000.00		~~358~~377,~~543~~871,~~113~~941.2372		-	~~408~~575,~~146~~569,~~809~~944.4955	~~408~~575,~~146~~569,~~809~~944.4955	~~766~~953,~~689~~441,~~922~~886.7227	-	20,156,333.48	1,~~212~~044,~~001~~578,~~523~~388.9993
LT-M1	100,523,000.00		2122,~~922~~559,~~048~~263.9609		-	6066,~~566~~086,~~905~~349.8082	6066,~~566~~086,~~905~~349.8082	8288,~~488~~645,~~954~~612.7691	-	-	3934,~~956~~436,~~094~~650.2018
LT-M2	83,769,000.00		18,~~168~~699,~~024~~036.5127		-	5055,~~472~~071,~~254~~791.8451	5055,~~472~~071,~~254~~791.8451	6873,~~640~~770,~~279~~827.3578	-	-	3328,~~296~~697,~~745~~208.1649
LT-M3	33,508,000.00		7,~~267~~479,~~287~~692.7748		-	2022,~~189~~029,~~301~~116.9361	2022,~~189~~029,~~301~~116.9361	2729,~~456~~508,~~589~~809.7009	-	-	1311,~~318~~478,~~698~~883.0739
LT-B1	40,209,000.00		8,~~698~~888,~~212~~076.7238		-	2731,~~017~~616,~~124~~660.1885	2731,~~017~~616,~~124~~660.1885	3540,~~715~~504,~~336~~737.9023	-	-	138,~~191~~592,~~875~~339.8215
LT-B2	23,455,000.00		4,~~685~~687,~~458~~882.7466		-	23,312,151.26	23,312,151.26	2728,~~997~~000,~~610~~033.0092	-	-	142,848.74
LT-B3	20,104,869.34		45,~~783~~122,~~329~~054.8605		-	-	-	45,~~783~~122,~~329~~054.8605	142,848.74	-	19,962,020.60
LT-R	-		-		-	-	-	-	-	-	-
Total	6,701,536,869.34		~~959~~981,~~928~~169,~~553~~024.4935		4,620,338,847.23	~~769~~953,~~341~~323,~~700~~167.2737	5,~~389~~573,~~680~~662,~~547~~014.5060	6,~~349~~554,~~609~~831,~~100~~038.9995	142,848.74	20,156,333.48	1,~~331~~147,~~869~~888,~~806~~339.5848
	Interest Detail
	Pass-	Prior Principal				Non-	Prior	Unscheduled		Paid or	Current
	Through	(with Notional)			Accrued	Supported	Unpaid	Interest	Optimal	Deferred	Unpaid
Class	Rate	Balance			Interest	Interest SF	Interest	Adjustments	Interest	Interest	Interest
					(1)	(2)	(3)	(4)	(5)=(1)-(2)+(3)+(4)	(6)	(7)=(5)-(6)
LT-A1	4.~~13144~~01760%	-			-	-	-	-	-	-	-
LT-A2	4.~~13144~~01760%	1,~~247~~072,~~753~~558,~~150~~909.9963			43,~~295~~590,~~844~~928.8389	-	-	-	43,~~295~~590,~~844~~928.8389	43,~~295~~590,~~844~~928.8389	-
LT-M1	4.~~13144~~01760%	4135,~~134~~359,~~719~~084.2693			~~141~~118,~~621~~382.2627	-	-	-	~~141~~118,~~621~~382.2627	~~141~~118,~~621~~382.2627	-
LT-M2	4.~~13144~~01760%	3429,~~278~~465,~~932~~904.7211			~~118~~98,~~017~~651.7289	-	-	-	~~118~~98,~~017~~651.7289	~~118~~98,~~017~~651.7289	-
LT-M3	4.~~13144~~01760%	1311,~~711~~786,~~573~~361.0964			4739,~~207~~460.0976	-	-	-	4739,~~207~~460.0976	4739,~~207~~460.0976	-
LT-B1	4.~~13144~~01760%	149,~~174~~361,~~063~~034.3877			4831,~~799~~340.3876	-	-	-	4831,~~799~~340.3876	4831,~~799~~340.3876	-
LT-B2	4.~~13144~~01760%	142,848.74			~~491~~478.8126	-	-	-	~~491~~478.8126	~~491~~478.8126	-
LT-B3	4.~~13144~~01760%	19,962,020.60			6866,~~726~~832.5388	-	-	-	6866,~~726~~832.5388	6866,~~726~~832.5388	-
LT-R		-			-	-	-	-	-	-	-
Total		1,~~371~~178,~~157~~636,~~308~~164.7843			43,~~720~~946,~~708~~075.6271	-	-	-	43,~~720~~946,~~708~~075.6271	43,~~720~~946,~~708~~075.6271	-
							Page 3 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Upper Tier REMIC Series 2000-1
	Certificate Payment Report for April 26, 2004 Distribution
	Certificate Payment Report for September 27, 2004 Distribution
	Distribution in Dollars - Current Period
					Prior						Current
	Class	Original			Principal			Total	Realized	Deferred	Principal
Class	Type	Face Value			Balance	Interest	Principal	Distribution	Losses	Interest	Balance
					(1)	(2)	(3)	(4)=(2)+(3)	(5)	(6)	(7)=(1)-(3)-(5)+(6)
A1	STEP, FLT	4,799,976,000.00			-	-	-	-	-	-	-
A2	CSTR	1,599,992,000.00			1,~~247~~072,~~753~~558,~~150~~909.9963	43,~~440~~662,~~014~~904.7341	3527,~~751~~980,~~627~~520.0070	4031,~~191~~643,~~641~~425.7311	-	-	1,~~212~~044,~~001~~578,~~523~~388.9993
M1	MEZ, STEP	100,523,000.00			4135,~~134~~359,~~719~~084.2693	5465,~~480~~311.6518	1922,~~178,625~~434.0775	1987,~~233,105~~745.7293	-	-	3934,~~956~~436,~~094~~650.2018
M2	MEZ, STEP	83,769,000.00			3429,~~278~~465,~~932~~904.7211	5765,~~588~~230.6115	~~982~~768,~~187~~695.5662	1833,~~039,776~~925.1777	-	-	3328,~~296~~697,~~745~~208.1649
M3	MEZ, STEP	33,508,000.00			1311,~~711~~786,~~573~~361.0964	3436,~~614~~356.1001	~~392~~307,~~875~~478.0225	~~427~~343,~~489~~834.1226	-	-	1311,~~318~~478,~~698~~883.0739
B1	SUB, STEP	40,209,000.00			149,~~174~~361,~~063~~034.3877	6448,~~129~~182.7603	~~982~~768,~~187~~695.5662	1816,~~046,317~~877.3265	-	-	138,~~191~~592,~~875~~339.8215
B2	SUB, STEP	23,455,000.00			142,848.74	1,~~154~~259.2204	-	1,~~154~~259.2204	-	-	142,848.74
B3	SUB, CSTR	20,104,869.34			19,962,020.60	6866,~~726~~832.5288	-	6866,~~726~~832.5288	-	-	19,962,020.60
UT-R	R	-			-	-	-	-	-	-	-
Total		6,701,536,869.34			1,~~371~~178,~~157~~636,~~308~~164.7843	43,~~720~~946,~~708~~075.5970	3930,~~287~~747,~~502~~824.2095	4434,~~008~~693,~~210~~900.7965	-	-	1,~~331~~147,~~869~~888,~~806~~339.5848
	Interest Accrual Detail				Current Period Factor Information per $1,000 of Original Face
						Orig. Principal	Prior				Current
	Period	Period				(with Notional)	Principal			Total	Principal
Class	Starting	Ending		Method	Cusip	Balance	Balance	Interest	Principal	Distribution	Balance
							(1)	(2)	(3)	(4)=(2)+(3)	(5)
A1	0308/25/04	0409/2526/04		A-Act/360	863572L68	4,799,976,000.00	-	-	-	-	-
A2				F-30/360	863572L76	1,599,992,000.00	~~779~~670.~~849619~~352670	2.~~775023~~289327	2217.~~344879~~487913	2519.~~119902~~777240	~~757~~652.~~504740~~864757
M1	0308/25/04	0409/2526/04		A-Act/360	863572L84	100,523,000.00	~~409~~351.~~207040~~751191	0.~~541972~~649714	119.~~724929~~176355	129.~~266901~~826069	~~397~~342.~~482111~~574835
M2	0308/25/04	0409/2526/04		A-Act/360	863572L92	83,769,000.00	~~409~~351.~~207854~~751890	0.~~687469~~778691	119.~~724953~~176373	129.~~412422~~955064	~~397~~342.~~482901~~575517
M3	0308/25/04	0409/2526/04		A-Act/360	863572M26	33,508,000.00	~~409~~351.~~202969~~747691	1.~~033010~~084995	119.~~724813~~176264	1210.~~757823~~261259	~~397~~342.~~478156~~571428
B1	0308/25/04	0409/2526/04		A-Act/360	863572M34	40,209,000.00	~~352~~232.~~509721~~809440	1.~~594911~~198290	2419.~~427057~~117502	2620.~~021968~~315791	~~328~~213.~~082664~~691938
B2	0308/25/04	0409/2526/04		A-Act/360	863572M42	23,455,000.00	6.090332	0.~~049210~~053679	-	0.~~049210~~053679	6.090332
B3				F-30/360	863572M59	20,104,869.34	992.894819	3.~~418402~~324214	-	3.~~418402~~324214	992.894819
UT-R				F-30/360	863572M67	-	-	-	-	-	-
							Page 4 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Upper Tier REMIC Series 2000-1
	Certificate Payment Report for April 26, 2004 Distribution
	Certificate Payment Report for September 27, 2004 Distribution
	Distribution in Dollars - to Date
											Current
	Original				Unscheduled	Scheduled	Total	Total	Realized	Deferred	Principal
Class	Face Value		Interest		Principal	Principal	Principal	Distribution	Losses	Interest	Balance
	(1)		(2)		(3)	(4)	(5)=(3)+(4)	(6)=(2)+(5)	(7)	(8)	(9)=(1)-(5)-(7)+(8)
A1	4,799,976,000.00		386,931,317.18		4,620,338,847.23	179,637,152.77	4,799,976,000.00	5,186,907,317.18	-	-	-
A2	1,599,992,000.00		~~517~~537,~~482~~406,~~481~~505.3056		~~376~~527,~~080~~267,~~741~~220.6116	3248,~~066~~302,~~067~~724.8839	~~408~~575,~~146~~569,~~809~~944.4955	~~925~~1,~~629~~112,~~290~~976,450.7911	-	20,156,333.48	1,~~212~~044,~~001~~578,~~523~~388.9993
M1	100,523,000.00		13,~~315~~589,~~610~~868.5678		5661,~~667~~651,~~084~~254.7638	34,~~899~~435,~~821~~095.0443	6066,~~566~~086,~~905~~349.8082	7379,~~882~~676,~~516~~218.3660	-	-	3934,~~956~~436,~~094~~650.2018
M2	83,769,000.00		12,~~259~~541,~~481~~482.1369		4650,~~822~~976,~~666~~141.7139	34,~~649~~095,~~588~~650.1312	5055,~~472~~071,~~254~~791.8451	6267,~~731~~613,~~735~~274.9720	-	-	3328,~~296~~697,~~745~~208.1649
M3	33,508,000.00		6,~~047~~210,~~072~~653.6567		1820,~~729~~390,~~437~~827.3017	1,~~459~~638,~~864~~289.6443	2022,~~189~~029,~~301~~116.9361	2628,~~236~~239,~~374~~770.5828	-	-	1311,~~318~~478,~~698~~883.0739
B1	40,209,000.00		10,~~477~~729,~~484~~671.3647		2429,~~988~~141,~~464~~938.2089	2,~~028~~474,~~659~~721.97	2731,~~017~~616,~~124~~660.1885	3742,~~494~~346,~~608~~332.5432	-	-	138,~~191~~592,~~875~~339.8215
B2	23,455,000.00		8,~~631~~637,~~776~~470.4594		21,701,370.05	1,610,781.21	23,312,151.26	31,~~943~~949,~~927~~622.7120	-	-	142,848.74
B3	20,104,869.34		45,~~783~~122,~~329~~054.8302		-	-	-	45,~~783~~122,~~329~~054.8302	142,848.74	-	19,962,020.60
UT-R	-		-		-	-	-	-	-	-	-
Total	6,701,536,869.34		~~959~~981,~~928~~169,~~553~~024.4631		5,~~165~~331,~~328~~467,~~611~~599.8628	~~224~~242,~~351~~194,~~935~~415.6432	5,~~389~~573,~~680~~662,~~547~~014.5060	6,~~349~~554,~~609~~831,~~100~~038.9691	142,848.74	20,156,333.48	1,~~331~~147,~~869~~888,~~806~~339.5848
	Interest Detail
	Pass-	Prior Principal				Non-	Prior	Unscheduled		Paid or	Current
	Through	(with Notional)			Accrued	Supported	Unpaid	Interest	Optimal	Deferred	Unpaid
Class	Rate	Balance			Interest	Interest SF	Interest	Adjustments	Interest	Interest	Interest
					(1)	(2)	(3)	(4)	(5)=(1)-(2)+(3)+(4)	(6)	(7)=(5)-(6)
A1	1.~~38000~~90500%	-			-	-	-	-	-	-	-
A2	4.~~27009~~09813%	1,~~247~~072,~~753~~558,~~150~~909.9963			43,~~440~~662,~~014~~904.7341	-	-	-	43,~~440~~662,~~014~~904.7341	43,~~440~~662,~~014~~904.7341	-
M1	12.~~49000~~01500%	4135,~~134~~359,~~719~~084.2693			5465,~~480~~311.6518	-	-	-	5465,~~480~~311.6518	5465,~~480~~311.6518	-
M2	12.~~89000~~41500%	3429,~~278~~465,~~932~~904.7211			5765,~~588~~230.6115	-	-	-	5765,~~588~~230.6115	5765,~~588~~230.6115	-
M3	23.~~84000~~36500%	1311,~~711~~786,~~573~~361.0964			3436,~~614~~356.1001	-	-	-	3436,~~614~~356.1001	3436,~~614~~356.1001	-
B1	5.~~09000~~61500%	149,~~174~~361,~~063~~034.3877			6448,~~129~~182.7603	-	-	-	6448,~~129~~182.7603	6448,~~129~~182.7603	-
B2	9.~~09000~~61500%	142,848.74			1,~~154~~259.2204	-	-	-	1,~~154~~259.2204	1,~~154~~259.2204	-
B3	4.~~13144~~01760%	19,962,020.60			6866,~~726~~832.5388	-	-	-	6866,~~726~~832.5388	6866,~~726~~832.5288	-
UT-R		-			-	-	-	-	-	-	-
Total		1,~~371~~178,~~157~~636,~~308~~164.7843			43,~~720~~946,~~708~~075.6070	-	-	-	43,~~720~~946,~~708~~075.6070	43,~~720~~946,~~708~~075.5970	-
							Page 5 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	A2-2 Components Series 2000-1
	Certificate Payment Report for April 26, 2004 Distribution
	Certificate Payment Report for September 27, 2004 Distribution
	Distribution in Dollars - Current Period
					Prior						Current
	Class	Original			Principal			Total	Realized	Deferred	Principal
Class	Type	Face Value			Balance	Interest	Principal	Distribution	Losses	Interest	Balance
					(1)	(2)	(3)	(4)=(2)+(3)	(5)	(6)	(7)=(1)-(3)-(5)+(6)
A1X		-			-	-	-	-	-	-	-
A2X		-			-	43,~~295~~590,~~844~~928.8389	-	43,~~295~~590,~~844~~928.8389	-	-	-
M1X		-			-	8753,~~140~~071.6109	-	8753,~~140~~071.6109	-	-	-
M2X		-			-	6033,~~429~~421.1175	-	6033,~~429~~421.1175	-	-	-
M3X		-			-	123,~~592~~104.9874	-	123,~~592~~104.9874	-	-	-
B1X		-			-	-	-	-	-	-	-
B2X		-			-	-	-	-	-	-	-
Total		-			-	43,~~456~~680,~~007~~526.5347	-	43,~~456~~680,~~007~~526.5347	-	-	-
	Interest Accrual Detail				Current Period Factor Information per $1,000 of Original Face
						Orig. Principal	Prior				Current
	Period	Period				(with Notional)	Principal			Total	Principal
Class	Starting	Ending		Method	Cusip	Balance	Balance	Interest	Principal	Distribution	Balance
							(1)	(2)	(3)	(4)=(2)+(3)	(5)
A1X				A-30/360		4,799,976,000.00	-	-	-	-	-
A2X				A-30/360		1,599,992,000.00	~~779~~670.~~849619~~352670	2.~~684916~~244342	-	2.~~684916~~244342	~~757~~652.~~504740~~864757
M1X				A-30/360		100,523,000.00	~~409~~351.~~207040~~751191	0.~~866872~~527950	-	0.~~866872~~527950	~~397~~342.~~482111~~574835
M2X				A-30/360		83,769,000.00	~~409~~351.~~207854~~751890	0.~~721378~~398975	-	0.~~721378~~398975	~~397~~342.~~482901~~575517
M3X				A-30/360		33,508,000.00	~~409~~351.~~202969~~747691	0.~~375820~~092657	-	0.~~375820~~092657	~~397~~342.~~478156~~571428
B1X				A-30/360		40,209,000.00	~~352~~232.~~509721~~809440	-	-	-	~~328~~213.~~082664~~691938
B2X				A-30/360		23,455,000.00	6.090332	-	-	-	6.090332
							Page 6 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	A2-2 Components Series 2000-1
	Certificate Payment Report for April 26, 2004 Distribution
	Certificate Payment Report for September 27, 2004 Distribution
	Distribution in Dollars - to Date
											Current
	Original				Unscheduled	Scheduled	Total	Total	Realized	Deferred	Principal
Class	Face Value		Interest		Principal	Principal	Principal	Distribution	Losses	Interest	Balance
	(1)		(2)		(3)	(4)	(5)=(3)+(4)	(6)=(2)+(5)	(7)	(8)	(9)=(1)-(5)-(7)+(8)
A1X	-		149,714,942.52		-	-	-	149,714,942.52	-	-	-
A2X	-		~~358~~377,~~543~~871,~~113~~941.2675		-	-	-	~~358~~377,~~543~~871,~~113~~941.2675	-	-	-
M1X	-		89,~~639~~002,~~522~~478.6051		-	-	-	89,~~639~~002,~~522~~478.6051	-	-	-
M2X	-		6,~~036~~285,~~260~~270.4365		-	-	-	6,~~036~~285,~~260~~270.4365	-	-	-
M3X	-		1,~~488~~537,~~337~~160.1685		-	-	-	1,~~488~~537,~~337~~160.1685	-	-	-
B1X	-		92,561.42		-	-	-	92,561.42	-	-	-
B2X	-		18,068.86		-	-	-	18,068.86	-	-	-
Total	-		~~524~~544,~~532~~522,~~806~~424.2556		-	-	-	~~524~~544,~~532~~522,~~806~~424.2556	-	-	-
	Interest Detail
	Pass-	Prior Principal				Non-	Prior	Unscheduled		Paid or	Current
	Through	(with Notional)			Accrued	Supported	Unpaid	Interest	Optimal	Deferred	Unpaid
Class	Rate	Balance			Interest	Interest SF	Interest	Adjustments	Interest	Interest	Interest
					(1)	(2)	(3)	(4)	(5)=(1)-(2)+(3)+(4)	(6)	(7)=(5)-(6)
A1X	21.~~65944~~92210%	-			-	-	-	-	-	-	-
A2X	4.~~13144~~01760%	1,~~247~~072,~~753~~558,~~150~~909.9963			43,~~295~~590,~~844~~928.8389	-	-	-	43,~~295~~590,~~844~~928.8389	43,~~295~~590,~~844~~928.8389	-
M1X	21.~~54210~~80110%	4135,~~134~~359,~~719~~084.2693			8753,~~140~~071.6109	-	-	-	8753,~~140~~071.6109	8753,~~140~~071.6109	-
M2X	21.~~11544~~36110%	3429,~~278~~465,~~932~~904.7211			6033,~~429~~421.1175	-	-	-	6033,~~429~~421.1175	6033,~~429~~421.1175	-
M3X	10.~~10210~~31610%	1311,~~711~~786,~~573~~361.0964			123,~~592~~104.9874	-	-	-	123,~~592~~104.9874	123,~~592~~104.9874	-
B1X		149,~~174~~361,~~063~~034.3877			-	-	-	-	-	-	-
B2X		142,848.74			-	-	-	-	-	-	-
Total		1,~~351~~158,~~195~~674,~~288~~143.1883			43,~~456~~680,~~007~~526.5347	-	-	-	43,~~456~~680,~~007~~526.5347	43,~~456~~680,~~007~~526.5347	-
							Page 7 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Collection Account Report for April 26, 2004 Distribution
	Collection Account Report for September 27, 2004 Distribution
	Collection Account Report
SUMMARY								TOTAL
	Principal Collections							3930,~~287~~747,~~502~~824.2095
	Principal Withdrawals							0.00
	TOTAL PRINCIPAL							3930,~~287~~747,~~502~~824.2095
	Interest Collections							54,~~042~~208,~~277~~679.7712
	Interest Withdrawals							0.00
	Interest Other Accounts							0.00
	Interest Fees							(~~321~~262,~~569~~603.1842)
	TOTAL INTEREST							43,~~720~~946,~~708~~075.5970
	TOTAL AVAILABLE FUNDS							4434,~~008~~693,~~210~~900.7965
PRINCIPAL - COLLECTIONS								TOTAL
	Scheduled Principal							3,~~907~~369,~~387~~402.3564
	Curtailments							1,~~789~~338,~~542~~093.0624
	Prepayments in Full							3326,~~590~~040,~~572~~329.7907
	Repurchases/Substitutions							0.00
	Liquidations							0.00
	Insurance Principal							0.00
	Other Additional Principal							0.00
	Delinquent Principal							(~~964~~945,~~595~~591.8414)
	Principal Advanced							~~964~~945,~~595~~591.8414
	Total Realized Loss Of Principal							0.00
	TOTAL PRINCIPAL COLLECTED							3930,~~287~~747,~~502~~824.2095
				Page 8 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Collection Account Report for April 26, 2004 Distribution
	Collection Account Report for September 27, 2004 Distribution
	Collection Account Report
PRINCIPAL - WITHDRAWALS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
PRINCIPAL - OTHER ACCOUNTS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
INTEREST - COLLECTIONS								TOTAL
	Scheduled Interest							54,~~150~~315,~~337~~381.8971
	Repurchases/Substitutions							0.00
	Liquidations							0.00
	Insurance Interest							0.00
	Other Additional Interest							0.00
	Prepayment Interest Shortfalls							0.00
	Delinquent Interest							(1,~~298~~261,~~058~~283.3962)
	Compensating Interest							0.00
	Relief Act Shortfall Amounts							0.00
	Interest Advanced							1,~~189~~154,~~998~~581.2703
	Deferred Interest							0.00
	TOTAL INTEREST							54,~~042~~208,~~277~~679.7712
				Page 9 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Collection Account Report for April 26, 2004 Distribution
	Collection Account Report for September 27, 2004 Distribution
	Collection Account Report
INTEREST - WITHDRAWALS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
INTEREST - OTHER ACCOUNTS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
INTEREST - FEES								TOTAL
	Curent Servicing Fees							~~320~~261,~~426~~621.5522
	Trustee Fee							~~1,142~~982.6320
	TOTAL INTEREST FEES							~~321~~262,~~569~~603.1842
				Page 10 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Credit Enhancement Report for April 26, 2004 Distribution
	Credit Enhancement Report for September 27, 2004 Distribution
	Credit Enhancement Report
ACCOUNTS								TOTAL
	Beginning Reserve Fund Balance							5,000.00
	Curr Period Required Reserve Fund Deposit							1517,~~992~~622.7905
	Curr Distributions from Reserve Fund							(1517,~~992~~622.7905)
	Reserve Fund Balance							5,000.00
INSURANCE								TOTAL
SPACE INTENTIONALLY LEFT BLANK
STRUCTURAL FEATURES								TOTAL
SPACE INTENTIONALLY LEFT BLANK
				Page 11 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Collateral Report for April 26, 2004 Distribution
	Collateral Report for September 27, 2004 Distribution
	Collateral Report
COLLATERAL								TOTAL
	Loan Count:
	Original							17816
	Prior							43,~~354~~846
	Prefunding							-
	Scheduled Paid Offs							-
	Full Voluntary Prepayments							(~~106~~82)
	Repurchases							-
	Liquidations							-
	Current							43,~~248~~764
	Principal Balance:
	Original							6,701,536,869.34
	Prior							1,~~371~~178,~~157~~636,~~308~~164.7843
	Prefunding							-
	Scheduled Principal							(3,~~907~~369,~~387~~402.3564)
	Partial and Full Voluntary Prepayments							(3527,~~380~~378,~~114~~422.8531)
	Repurchases							-
	Liquidations							-
	Current							1,~~331~~147,~~869~~888,~~806~~339.5848
PREFUNDING								TOTAL
SPACE INTENTIONALLY LEFT BLANK
Current Prin Balance by Groups (in millions of dollars)					Total Current Principal Balance (in millions of dollars)
				Page 12 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Collateral Report for April 26, 2004 Distribution
	Collateral Report for September 27, 2004 Distribution
	Collateral Report
CHARACTERISTICS								TOTAL
	Weighted Average Coupon Original							7.423436%
	Weighted Average Coupon Prior							4.~~527834~~410938%
	Weighted Average Coupon Current							4.~~507437~~393602%
	Weighted Average Months to Maturity Original							332
	Weighted Average Months to Maturity Prior							~~283~~277
	Weighted Average Months to Maturity Current							~~281~~276
	Weighted Avg Remaining Amortization Term Original							-
	Weighted Avg Remaining Amortization Term Prior							~~282~~277
	Weighted Avg Remaining Amortization Term Current							~~281~~276
	Weighted Average Seasoning Original							-
	Weighted Average Seasoning Prior							~~113~~119.4809
	Weighted Average Seasoning Current							~~114~~119.5492
Note: Original information refers to deal issue.
WAC by Groups					Total WAC
WARAT by Groups					Total WARAT
Note: Dates correspond to distribution dates.
				Page 13 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Collateral Report for April 26, 2004 Distribution
	Collateral Report for September 27, 2004 Distribution
	Collateral Report
ARM CHARACTERISTICS								TOTAL
	Weighted Average Margin Original							0.000%
	Weighted Average Margin Prior							2.~~438~~431%
	Weighted Average Margin Current							2.~~437~~428%
	Weighted Average Max Rate Original							0.000%
	Weighted Average Max Rate Prior							13.~~387~~399%
	Weighted Average Max Rate Current							13.~~377~~410%
	Weighted Average Min Rate Original							0.000%
	Weighted Average Min Rate Prior							3.~~231~~204%
	Weighted Average Min Rate Current							3.~~228~~203%
	Weighted Average Cap Up Original							0.000%
	Weighted Average Cap Up Prior							0.001%
	Weighted Average Cap Up Current							0.001%
	Weighted Average Cap Down Original							0.000%
	Weighted Average Cap Down Prior							0.001%
	Weighted Average Cap Down Current							0.001%
Note: Original information refers to deal issue.
SERVICING FEES / ADVANCES								TOTAL
	Current Servicing Fees							~~320~~261,~~426~~621.5522
	Delinquent Servicing Fees							~~108~~106,~~060~~702.1159
	TOTAL SERVICING FEES							~~428~~368,~~486~~323.6681
	Total Servicing Fees							~~428~~368,~~486~~323.6681
	Compensating Interest							0.00
	Delinquent Servicing Fees							(~~108~~106,~~060~~702.1159)
	COLLECTED SERVICING FEES							~~320~~261,~~426~~621.5522
	Current PPIS							0.00
	Current Net PPIS							0.00
	Total Advanced Principal For Current Payment Date							~~964~~945,~~595~~591.8414
	Total Advanced Interest For Current Payment Date							1,~~189~~154,~~998~~581.2703
	TOTAL ADVANCES FOR CURRENT PERIOD							2,~~154~~100,~~594~~172.1117
ADDITIONAL COLLATERAL INFORMATION								TOTAL
SPACE INTENTIONALLY LEFT BLANK
				Page 14 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Delinquency Report for April 26, 2004 Distribution
	Delinquency Report for September 27, 2004 Distribution
	Delinquency Report - Total
				<1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT		Balance			97,~~603~~088,~~156~~739.1244	2723,~~326,432~~248.3738	2715,~~199,094~~338.9953	148,~~128~~527,~~683~~326.4835
		% Balance			0.7262%	0.1706%	0.1706%	10.0674%
		# Loans			2220	73	73	3626
		% # Loans			0.5253%	0.1608%	0.1608%	0.8569%
FORECLOSURE		Balance		-	-	-	24,~~288~~521,~~596~~724.6216	24,~~288~~521,~~596~~724.6216
		% Balance		0.00%	0.00%	0.00%	0.1739%	0.1739%
		# Loans		-	-	-	510	510
		% # Loans		0.00%	0.00%	0.00%	0.1227%	0.1227%
BANKRUPTCY		Balance		42,~~864~~359,~~424~~604.6221	~~321~~253,~~511~~889.1081	~~444~~423,~~766~~118.7826	~~727~~1,~~573~~491,933.0191	64,~~358~~528,~~275~~546.5119
		% Balance		0.3721%	0.02%	0.0304%	0.0513%	0.4839%
		# Loans		137	1	1	23	1712
		% # Loans		0.3119%	0.0203%	0.0203%	0.0508%	0.4032%
REO		Balance		-	-	-	1,~~538~~439,~~867~~184.0435	1,~~538~~439,~~867~~184.0435
		% Balance		0.00%	0.00%	0.00%	0.1213%	0.1213%
		# Loans		-	-	-	3	3
		% # Loans		0.00%	0.00%	0.00%	0.0708%	0.0708%
TOTAL		Balance		42,~~864~~359,~~424~~604.6221	97,~~924~~342,~~667~~629.2225	21,~~771~~146,~~199~~366.1564	68,~~754~~168,~~131~~180.6695	2419,~~314~~016,~~422~~781.6505
		% Balance		0.3721%	0.7564%	0.2110%	0.5171%	1.8366%
		# Loans		137	2321	84	1719	6151
		% # Loans		0.3119%	0.5456%	0.1911%	0.4050%	1.4435%
Note: <1 Payment = 0-29days, 1 Payment = 30-59days, 2 Payments = 60-89days, 3+ Payments = 90+
								6 Months Moving Average
1 or 2 Payments Delinquent					3 or More Payments Delinquent
Total Foreclosure					Total Bankruptcy and REO
Note: Dates correspond to distribution dates.
				Page 15 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	REO Report for April 26, 2004 Distribution
	REO Report for September 27, 2004 Distribution
	REO Report - Mortgage Loans that Become REO During Current Distribution
SUMMARY				LOAN GROUP
Total Loan Count = 0				Loan Group 1 = ; REO Book Value = Not Available
Total Loan Count = 1				Loan Group 1 = ; REO Book Value = Not Available
Total Original Principal Balance = 000.00
Total Original Principal Balance = 268,300.00
Total Current Balance = 000.00
Total Current Balance = 252,194.22
REO Book Value = Not Available
REO Book Value reported corresponds to total REO loans, including loans that become REO during current distribution.
Loan Number		Original	Stated		Current	State &
&		Principal	Principal	Paid to	Note	LTV at	Original	Origination
Loan Group		Balance	Balance	Date	Rate	Origination	Term	Date
SPACE INTENTIONALLY LEFT BLANK
817725666 1		268,300.00	252,194.22	Jun-01-03	4.208%	NC - 79.61%	360	Oct-23-96
				Page 16 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Prepayment Report for April 26, 2004 Distribution
	Prepayment Report for September 27, 2004 Distribution
	Prepayment Report - Voluntary Prepayments
VOLUNTARY PREPAYMENTS								TOTAL
	Current
	Number of Paid in Full Loans							~~106~~82
	Number of Repurchased Loans							-
	Total Number of Loans Prepaid in Full							~~106~~82
	Paid in Full Balance							3326,~~590~~040,~~572~~329.7907
	Repurchased Loans Balance							-
	Curtailments Amount							1,~~789~~338,~~542~~093.0624
	Total Prepayment Amount							3527,~~380~~378,~~114~~422.8531
	Cumulative
	Number of Paid in Full Loans							89,~~572~~056
	Number of Repurchased Loans							-
	Total Number of Loans Prepaid in Full							89,~~572~~056
	Paid in Full Balance							45,~~959~~118,~~692~~440,~~713~~365.7315
	Repurchased Loans Balance							-
	Curtailments Amount							~~185~~193,~~622~~013,~~413~~749.39
	Total Prepayment Amount							5,~~145~~311,~~315~~454,~~127~~114.1254
SPACE INTENTIONALLY LEFT BLANK
Total Prepayments by Groups (in thousands of dollars)					Total Prepayments (in thousands of dollars)
				Page 17 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Prepayment Report for April 26, 2004 Distribution
	Prepayment Report for September 27, 2004 Distribution
	Prepayment Report - Voluntary Prepayments
VOLUNTARY PREPAYMENT RATES								TOTAL
	SMM							2.5933%
	3 Months Avg SMM							2.2252%
	12 Months Avg SMM							32.5486%
	Avg SMM Since Cut-off							3.0804%
	CPR							2624.9964%
	3 Months Avg CPR							2326.6139%
	12 Months Avg CPR							3529.1536%
	Avg CPR Since Cut-off							3130.2995%
	PSA							~~449~~410.8862%
	3 Months Avg PSA Approximation							~~393~~439.5588%
	12 Months Avg PSA Approximation							~~585~~489.7941%
	Avg PSA Since Cut-off Approximation							~~521~~515.4383%
CPR by Groups					Total CPR
PSA by Groups					Total PSA
				Page 18 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Prepayment Report for April 26, 2004 Distribution
	Prepayment Report for September 27, 2004 Distribution
	Prepayment Report - Voluntary Prepayments
CPR Avg since Cut-Off by Groups					Total CPR Avg since Cut-Off
PSA Avg since Cut-Off by Groups					Total PSA Avg since Cut-Off
PREPAYMENT CALCULATION METHODOLOGY
Single Monthly Mortality (SMM): (Voluntary partial and full prepayments + Repurchases)/(Beg Principal Balance - Sched Principal)
Conditional Prepayment Rate (CPR): 1-((1-SMM)^12)
PSA Standard Prepayment Model: CPR/(0.02*min(30,WAS))
Average SMM over period between nth month and mth month (AvgSMMn,m): [(1-SMMn) * (1-SMMn+1) .......(1-SMMm)]^(1/months in period n,m)
Average CPR over period between the nth month and mth month (AvgCPRn,m): 1-((1-AvgSMMn,m)^12)
Average PSA Approximation over period between the nth month and mth month: AvgCPRn,m/(0.02*Avg WASn,m))
Average PSA Approximation over period between the nth month and mth month: AvgCPRn,m/(0.002*Avg WASn,m))
Average WASn,m: (min(30,WASn)+min(30,WASn+1)+.......+min(30,WASm)/(number of months in the period n,m)
Weighted Average Seasoning (WAS)
Note: Prepayment rates are calculated since deal issue date and include partial and full voluntary prepayments and repurchases.
Dates correspond to distribution dates.
				Page 19 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Realized Loss Report for April 26, 2004 Distribution
	Realized Loss Report for September 27, 2004 Distribution
	Realized Loss Report - Collateral
COLLATERAL REALIZED LOSSES								TOTAL
	Current
	Number of Loans Liquidated							-
	Collateral Realized Loss/(Gain) Amount							-
	Net Liquidation Proceeds							-
	Cumulative
	Number of Loans Liquidated							-
	Collateral Realized Loss/(Gain) Amount							142,848.74
	Net Liquidation Proceeds							(142,848.74)
	Note: Collateral Realized Loss Amount may include adjustments to loans liquidated in prior periods.
SPACE INTENTIONALLY LEFT BLANK
							3 Months Moving Average
Collateral Loss Severity Approximation by Groups					Collateral Loss Severity Approximation
				Page 20 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Realized Loss Report for April 26, 2004 Distribution
	Realized Loss Report for September 27, 2004 Distribution
	Realized Loss Report - Collateral
DEFAULT SPEEDS								TOTAL
	MDR							0.00%
	3 Months Avg MDR							0.00%
	12 Months Avg MDR							0.00%
	Avg MDR Since Cut-off							0.00%
	CDR							0.00%
	3 Months Avg CDR							0.00%
	12 Months Avg CDR							0.00%
	Avg CDR Since Cut-off							0.00%
	SDA							0.00%
	3 Months Avg SDA Approximation							0.00%
	12 Months Avg SDA Approximation							0.00%
	Avg SDA Since Cut-off Approximation							0.00%
	Loss Severity Approximation for Current Period
	3 Months Avg Loss Severity Approximation
	12 Months Avg Loss Severity Approximation
	Avg Loss Severity Approximation Since Cut-off
CDR by Groups					Total CDR
SDA by Groups					Total SDA
				Page 21 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Realized Loss Report for April 26, 2004 Distribution
	Realized Loss Report for September 27, 2004 Distribution
	Realized Loss Report - Collateral
CDR Avg since Cut-Off by Groups					Total CDR Avg since Cut-Off
SDA Avg since Cut-Off by Groups					Total SDA Avg since Cut-Off
COLLATERAL REALIZED LOSS CALCULATION METHODOLOGY
Monthly Default Rate (MDR): (Beg Principal Balance of Liquidated Loans)/(Total Beg Principal Balance)
Conditional Default Rate (CDR): 1-((1-MDR)^12)
SDA Standard Default Assumption: CDR/IF(WAS<61,MIN(30,WAS)0.02,MAX(0.03,MIN(30,WAS)0.02-0.0095*(WAS-60)))
Average MDR over period between nth month and mth month (AvgMDRn,m): [(1-MDRn) * (1-MDRn+1) .......(1-MDRm)]^(1/months in period n,m)
Average CDR over period between the nth month and mth month (AvgCDRn,m): 1-((1-AvgMDRn,m)^12)
Average SDA Approximation over period between the nth month and mth month:
AvgCDRn,m/IF(Avg WASn,m<61,MIN(30,Avg WASn,m)0.02,MAX(0.03,MIN(30,Avg WASn,m)0.02-0.0095*(Avg WASn,m-60)))
Average WASn,m: (WASn + WASn+1 +.......+ WASm )/(number of months in the period n,m)
Loss Severity Approximation for current period: sum(Realized Loss Amount)/sum(Beg Principal Balance of Liquidated Loans)
Average Loss Severity Approximation over period between nth month and mth month: Avg(Loss Severityn,m)
Note: Default rates are calculated since deal issue date and include realized gains and additional realized losses and gains from prior periods.
Dates correspond to distribution dates.
				Page 22 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Realized Loss Detail Report for April 26, 2004 Distribution
	Realized Loss Detail Report for September 27, 2004 Distribution
	Realized Loss Detail Report - Loans Liquidated During Current Distribution
SUMMARY							LOAN GROUP
Total Loan Count Current Losses = 0
Total Loan Count Revisions = 0						Loan Group 1 =
Total Prior Principal Balance = 0.00
Total Current Realized Loss Amount = 0.00
Total Revisions Amount = 0.00
Total Realized Loss Amount = 0.00
Total Net Liquidation Proceeds = 0.00
Note: Total Realized Loss Amount may include adjustments to loans liquidated in prior periods.
Loan Number			Current	State &		Prior	Realized		Cumulative
&		Loan	Note	LTV at	Original	Principal	Loss/(Gain)	Realized	Realized
Loan Group		Status	Rate	Origination	Term	Balance	Revisions	Loss/(Gain)	Loss/(Gain)
SPACE INTENTIONALLY LEFT BLANK
					Page 23 of 24				© COPYRIGHT 2004 Deutsche Bank
	Washington Mutual 2000-1
	Mortgage Pass-Through Certificates
	Additional Certificate Report for April 26, 2004 Distribution
	Additional Certificate Report for September 27, 2004 Distribution
	Additional Certificate Report
	CLASS			Carryforward Interest		Basis Risk Shortfall Reimbursed	Basis Risk Shortfall	Unpaid Basis Risk Shortfall
	A1			0.00		0.00	0.00	0.00
	A2			0.00		0.00	0.00	0.00
	M1			0.00		0.00	0.00	0.00
	M2			0.00		0.00	0.00	0.00
	M3			0.00		0.00	0.00	0.00
	B1			0.00		1516,~~330~~841.3827	1516,~~330~~841.3827	0.00
	B2			0.00		~~662~~780.4178	~~662~~780.4178	0.00
				Page 24 of 24				© COPYRIGHT 2004 Deutsche Bank

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