WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR5
Distribution Date: 09/27/2004

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	PPIS	Uncomp Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unsched Int	Prin Reimbursed	Subsequent Recoveries	Total Dist	Ending Class Bal
A1	929227Q82	$182,226,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
A2	929227Q90	$78,283,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
A3	929227R24	$126,199,000.00	$10,427,855.62	3.1120000000%	3.1120000000%	$27,042.91	$9,481,080.17	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9,508,123.08	$946,775.45
A4	929227R32	$84,884,000.00	$84,884,000.00	3.6410000000%	3.6410000000%	$257,552.20	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$257,552.20	$84,884,000.00
A5	929227R40	$84,226,000.00	$84,226,000.00	3.8410000000%	3.8410000000%	$269,593.39	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$269,593.39	$84,226,000.00
A6	929227R57	$172,206,000.00	$172,206,000.00	3.6950000000%	3.6950000000%	$530,250.97	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$530,250.97	$172,206,000.00
A7	929227R65	$728,025,000.00	$351,744,338.75	4.2080000000%	4.2080000000%	$1,233,450.15	$9,481,093.19	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$10,714,543.34	$342,263,245.56
X1	929227R81	$728,024,000.00	$351,743,855.62	0.7560000000%	0.7560000000%	$221,598.63	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$221,598.63	$342,262,775.45
X2	929227R99	$728,025,000.00	$351,744,338.75	0.3318042641%	0.3318042641%	$97,258.56	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$97,258.56	$342,263,245.56
B1	929227S23	$15,728,000.00	$15,664,459.98	4.5398042641%	4.5398042641%	$59,261.32	$207,170.75	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$266,432.07	$15,457,289.23
B2	929227S31	$11,983,000.00	$11,934,589.52	4.5398042641%	4.5398042641%	$45,150.58	$157,841.25	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$202,991.83	$11,776,748.27
B3	929227S49	$5,991,000.00	$5,966,796.80	4.5398042641%	4.5398042641%	$22,573.41	$78,914.04	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$101,487.45	$5,887,882.76
B4	929227S56	$2,246,000.00	$2,236,926.30	4.5398042641%	4.5398042641%	$8,462.67	$29,584.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$38,047.20	$2,207,341.77
B5	929227S64	$2,246,000.00	$2,236,926.30	4.5398042641%	4.5398042641%	$8,462.67	$29,584.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$38,047.20	$2,207,341.77
B6	929227S72	$3,750,305.95	$3,735,154.95	4.5398042641%	4.5398042641%	$14,130.73	$49,399.40	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$63,530.12	$3,685,755.55
R	929227R73	$100.00	$0.00	0.0000000000%	0.0000000000%	$0.43	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.43	$0.00
SFEE	XXXXXXXXX	$728,024,000.00	$351,743,855.62	0.0841593495%	0.0841593495%	$24,668.78	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$24,668.78	$342,262,775.45
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total		$1,497,993,405.95	$745,263,048.22			$2,819,457.40	$19,514,667.86	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$22,334,125.26	$725,748,380.36

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR5
Distribution Date: 09/27/2004

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A1	$182,226,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
A2	$78,283,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
A3	$126,199,000.00	$10,427,855.62	$0.00	$0.00	$0.00	$0.00	$9,481,080.17	0.0075022421	$946,775.45
A4	$84,884,000.00	$84,884,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$84,884,000.00
A5	$84,226,000.00	$84,226,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$84,226,000.00
A6	$172,206,000.00	$172,206,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$172,206,000.00
A7	$728,025,000.00	$351,744,338.75	$0.00	$0.00	$0.00	$0.00	$9,481,093.19	0.4701256764	$342,263,245.56
X1	$728,024,000.00	$351,743,855.62	$0.00	$0.00	$0.00	$0.00	$0.00	0.4701256764	$342,262,775.45
X2	$728,025,000.00	$351,744,338.75	$0.00	$0.00	$0.00	$0.00	$0.00	0.4701256764	$342,263,245.56
B1	$15,728,000.00	$15,664,459.98	$0.00	$0.00	$0.00	$0.00	$207,170.75	0.9827879724	$15,457,289.23
B2	$11,983,000.00	$11,934,589.52	$0.00	$0.00	$0.00	$0.00	$157,841.25	0.9827879721	$11,776,748.27
B3	$5,991,000.00	$5,966,796.80	$0.00	$0.00	$0.00	$0.00	$78,914.04	0.9827879753	$5,887,882.76
B4	$2,246,000.00	$2,236,926.30	$0.00	$0.00	$0.00	$0.00	$29,584.53	0.9827879653	$2,207,341.77
B5	$2,246,000.00	$2,236,926.30	$0.00	$0.00	$0.00	$0.00	$29,584.53	0.9827879653	$2,207,341.77
B6	$3,750,305.95	$3,735,154.95	$0.00	$0.00	$0.00	$0.00	$49,399.40	0.9827879643	$3,685,755.55
R	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
SFEE	$728,024,000.00	$351,743,855.62	$0.00	$0.00	$0.00	$0.00	$0.00	0.4701256764	$342,262,775.45
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$1,497,993,405.95	$745,263,048.22	$0.00	$0.00	$0.00	$0.00	$19,514,667.86	0.4844803572	$725,748,380.36

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR5
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A1	$182,226,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
A2	$78,283,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
A3	$126,199,000.00	82.63025555	0.00000000	0.00000000	0.00000000	0.00000000	75.12801345	0.0075022421	7.50224209
A4	$84,884,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A5	$84,226,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A6	$172,206,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A7	$728,025,000.00	483.14870884	0.00000000	0.00000000	0.00000000	0.00000000	13.02303244	0.4701256764	470.12567640
X1	$728,024,000.00	483.14870886	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.4701256764	470.12567642
X2	$728,025,000.00	483.14870884	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.4701256764	470.12567640
B1	$15,728,000.00	995.96006994	0.00000000	0.00000000	0.00000000	0.00000000	13.17209753	0.9827879724	982.78797241
B2	$11,983,000.00	995.96007010	0.00000000	0.00000000	0.00000000	0.00000000	13.17209797	0.9827879721	982.78797213
B3	$5,991,000.00	995.96007344	0.00000000	0.00000000	0.00000000	0.00000000	13.17209815	0.9827879753	982.78797530
B4	$2,246,000.00	995.96006233	0.00000000	0.00000000	0.00000000	0.00000000	13.17209706	0.9827879653	982.78796527
B5	$2,246,000.00	995.96006233	0.00000000	0.00000000	0.00000000	0.00000000	13.17209706	0.9827879653	982.78796527
B6	$3,750,305.95	995.96006294	0.00000000	0.00000000	0.00000000	0.00000000	13.17209867	0.9827879643	982.78796427
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
SFEE	$728,024,000.00	483.14870886	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.4701256764	470.12567642
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR5
Distribution Date: 09/27/2004

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Current Int Accrued	Int Shortfall	PPIS	Uncompensated Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
A1	$182,226,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
A2	$78,283,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
A3	$126,199,000.00	3.1120000000%	3.1120000000%	$10,427,855.62	$27,042.91	$0.00	$0.00	$0.00	$0.00	$0.00	$27,042.91
A4	$84,884,000.00	3.6410000000%	3.6410000000%	$84,884,000.00	$257,552.20	$0.00	$0.00	$0.00	$0.00	$0.00	$257,552.20
A5	$84,226,000.00	3.8410000000%	3.8410000000%	$84,226,000.00	$269,593.39	$0.00	$0.00	$0.00	$0.00	$0.00	$269,593.39
A6	$172,206,000.00	3.6950000000%	3.6950000000%	$172,206,000.00	$530,250.97	$0.00	$0.00	$0.00	$0.00	$0.00	$530,250.97
A7	$728,025,000.00	4.2080000000%	4.2080000000%	$351,744,338.75	$1,233,450.15	$0.00	$0.00	$0.00	$0.00	$0.00	$1,233,450.15
X1	$728,024,000.00	0.7560000000%	0.7560000000%	$351,743,855.62	$221,598.63	$0.00	$0.00	$0.00	$0.00	$0.00	$221,598.63
X2	$728,025,000.00	0.3318042641%	0.3318042641%	$351,744,338.75	$97,258.56	$0.00	$0.00	$0.00	$0.00	$0.00	$97,258.56
B1	$15,728,000.00	4.5398042641%	4.5398042641%	$15,664,459.98	$59,261.32	$0.00	$0.00	$0.00	$0.00	$0.00	$59,261.32
B2	$11,983,000.00	4.5398042641%	4.5398042641%	$11,934,589.52	$45,150.58	$0.00	$0.00	$0.00	$0.00	$0.00	$45,150.58
B3	$5,991,000.00	4.5398042641%	4.5398042641%	$5,966,796.80	$22,573.41	$0.00	$0.00	$0.00	$0.00	$0.00	$22,573.41
B4	$2,246,000.00	4.5398042641%	4.5398042641%	$2,236,926.30	$8,462.67	$0.00	$0.00	$0.00	$0.00	$0.00	$8,462.67
B5	$2,246,000.00	4.5398042641%	4.5398042641%	$2,236,926.30	$8,462.67	$0.00	$0.00	$0.00	$0.00	$0.00	$8,462.67
B6	$3,750,305.95	4.5398042641%	4.5398042641%	$3,735,154.95	$14,130.73	$0.00	$0.00	$0.00	$0.00	$0.00	$14,130.73
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$0.43	$0.00	$0.00	$0.00	$0.00	$0.00	$0.43
SFEE	$728,024,000.00	0.0841593495%	0.0841593495%	$351,743,855.62	$24,668.78	$0.00	$0.00	$0.00	$0.00	$0.00	$24,668.78
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total	$1,497,993,405.95			$745,263,048.22	$2,819,457.40	$0.00	$0.00	$0.00	$0.00	$0.00	$2,819,457.40

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR5
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	PPIS	Uncompensated Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
A1	$182,226,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
A2	$78,283,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
A3	$126,199,000.00	3.1120000000%	3.1120000000%	82.63025555	0.21428783	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.21428783
A4	$84,884,000.00	3.6410000000%	3.6410000000%	1,000.00000000	3.03416663	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.03416663
A5	$84,226,000.00	3.8410000000%	3.8410000000%	1,000.00000000	3.20083335	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.20083335
A6	$172,206,000.00	3.6950000000%	3.6950000000%	1,000.00000000	3.07916670	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.07916670
A7	$728,025,000.00	4.2080000000%	4.2080000000%	483.14870884	1.69424148	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.69424148
X1	$728,024,000.00	0.7560000000%	0.7560000000%	483.14870886	0.30438369	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.30438369
X2	$728,025,000.00	0.3318042641%	0.3318042641%	483.14870884	0.13359234	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.13359234
B1	$15,728,000.00	4.5398042641%	4.5398042641%	995.96006994	3.76788657	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.76788657
B2	$11,983,000.00	4.5398042641%	4.5398042641%	995.96007010	3.76788617	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.76788617
B3	$5,991,000.00	4.5398042641%	4.5398042641%	995.96007344	3.76788683	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.76788683
B4	$2,246,000.00	4.5398042641%	4.5398042641%	995.96006233	3.76788513	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.76788513
B5	$2,246,000.00	4.5398042641%	4.5398042641%	995.96006233	3.76788513	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.76788513
B6	$3,750,305.95	4.5398042641%	4.5398042641%	995.96006294	3.76788726	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.76788726
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	4.30000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.30000000
SFEE	$728,024,000.00	0.0841593495%	0.0841593495%	483.14870886	0.03388457	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.03388457
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMU 03AR5
WEIGHTED AVERAGE PC RATE: 4.53980%
WEIGHTED AVERAGE MATURITY: 342.19978
WEIGHTED AVERAGE LOAN AGE: 17.25664
POOL NUMBER: 2079
ISSUE DATE: 04/25/2003
CERTIFICATE BALANCE AT ISSUE: $1,497,993,405.95
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1284		$745,263,048.23
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$198,326.69
Unscheduled Principal Collection/Reversals		$530,379.65
Liquidations-in-full	28	$18,785,961.52
Subsequent Recoveries		$0.00
Net principal Distributed		$19,514,667.86	-$19,514,667.86

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1256		$725,748,380.37

SCHEDULED INTEREST AT MORTGAGE RATE:		$3,083,404.72

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Interest Uncollected on Prepayment		$0.00
Uncompensated Uncollected Interest		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$263,947.32

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$22,334,125.26

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMU 03AR5
WEIGHTED AVERAGE PC RATE: 4.53980%
WEIGHTED AVERAGE MATURITY: 342.19978
WEIGHTED AVERAGE LOAN AGE: 17.25664
POOL NUMBER: ALL
ISSUE DATE: 04/25/2003
CERTIFICATE BALANCE AT ISSUE: $1,497,993,405.95
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1284		$745,263,048.23
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$198,326.69
Unscheduled Principal Collection/Reversals		$530,379.65
Liquidations-in-full	28	$18,785,961.52
Subsequent Recoveries		$0.00
Net principal Distributed		$19,514,667.86	-$19,514,667.86

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1256		$725,748,380.37

SCHEDULED INTEREST AT MORTGAGE RATE:		$3,083,404.72

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Interest Uncollected on Prepayment		$0.00
Uncompensated Uncollected Interest		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$263,947.32

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$22,334,125.26

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR5
Distribution Date: 09/27/2004

Distribution by Group
Pool ID		Principal		Interest		Total
Pool - 2079		$19,514,667.86		$2,819,457.40		$22,334,125.26
Aggregate		$19,514,667.86		$2,819,457.40		$22,334,125.26

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Pool - 2079	$745,263,048.23	1284	28	1256	$725,748,380.37	$198,326.69	$18,785,961.52	$530,379.65	$19,514,667.86
Aggregate	$745,263,048.23	1284	28	1256	$725,748,380.37	$198,326.69	$18,785,961.52	$530,379.65	$19,514,667.86

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Pool - 2079	9	$6,523,971.66	0	$0.00	0	$0.00	0	$0.00
Aggregate	9	$6,523,971.66	0	$0.00	0	$0.00	0	$0.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Pool - 2079		0		$0.00		0		$0.00
Aggregate		0		$0.00		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Pool - 2079			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR5
Distribution Date: 09/27/2004

INSURANCE RESERVES - Group 1
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$23,118,778.00	$0.00	$0.00	$0.00	$23,118,778.00
Bankruptcy Bond
Single-Units	$171,965.00	$0.00	$0.00	$0.00	$171,965.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$29,959,868.10	$0.00	$0.00	$0.00	$29,959,868.10

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$23,118,778.00	$0.00	$0.00	$0.00	$23,118,778.00
Bankruptcy Bond
Single-Units	$171,965.00	$0.00	$0.00	$0.00	$171,965.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$29,959,868.10	$0.00	$0.00	$0.00	$29,959,868.10

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR5
Distribution Date: 09/27/2004

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated April 22, 2003 to that certain Prospectus Supplement, dated March 19, 2003, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.



The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6 Certificatesimmediately after the principal and interest distribution on 200409 are as follows:

Class			Class Principal Balance
B1			$15,457,289.23
B2			$11,776,748.27
B3			$5,887,882.76
B4			$2,207,341.77
B5			$2,207,341.77
B6			$3,685,755.55
Total			$41,222,359.35
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.
The amount of the special hazard coverage, bankruptcy coverage, and fraud coverage, as of the above referenced distribution date, is $23,118,778.00, $171,965.00, $29,959,868.10 respectively, and such coverages are referred to in the table above under the column "Insurance Type" as "special hazard," "bankruptcy bond," and "mortgage repurchase," respectively. However, no policy of insurance exists for any such coverage, notwithstanding the reference to "insurance."

WAMU MORTGAGE PASS THROUGH CERTIFICATES SERIES 2003-AR5 8-K