2008-08-09 00:00:03 -

- Fitch Ratings has taken numerous rating actions on 17 Washington Mutual Mortgage Securities Corp. Prime RMBS transactions listed below:

-- WAMMS 2002-MS10;

-- WAMMS 2002-MS11;

-- WAMMS 2002-MS12;

-- WAMMS 2002-MS7;

-- WAMMS 2002-MS8;

-- WAMMS 2002-MS9;

-- WAMMS 2003-MS1;

-- WAMMS 2003-MS2;

-- WAMMS 2003-MS3;

-- WAMMS 2003-MS4;

-- WAMMS 2003-MS5;

-- WAMMS 2003-MS7;

-- WAMMS 2003-MS9;

-- WAMMS 2004-RA1;

-- WAMMS 2004-RA2;

-- WAMMS 2004-RA3;

--

WAMMS 2004-RA4.

The rating actions were taken as part as Fitch's ongoing surveillance process of existing transactions.

A spreadsheet detailing Fitch's rating actions on the transactions in question is available on the Fitch Ratings web site at www.fitchratings.com under the following headers:

Structured Finance then RMBS then Special Reports

Further information regarding current delinquency, loss, and credit enhancement statistics is also available at www.fitchratings.com.

Fitch's rating definitions and the terms of use of such ratings are available on the agency's public site, www.fitchratings.com. Published ratings, criteria and methodologies are available from this site, at all times. Fitch's code of conduct, confidentiality, conflicts of interest, affiliate firewall, compliance and other relevant policies and procedures are also available from the 'Code of Conduct' section of this site.

Fitch Ratings, New York
Tara Sweeney, 212-908-0347
Michele Patterson, 212-908-0779
Media Relations: Sandro Scenga, 212-908-0278