Ten classes of mezzanine and subordinated tranches from four mortgage-backed securitizations issued by Credit Suisse First Boston Mortgage Securities Corp. have been placed under review for possible downgrade by Moody's Investors Service.The affected securities are as follows: series 2001-11, class III-M; series 2001-AR19, classes C-B-2 and C-B-3; series 2001-28, classes I-B-1 through I-B-5; and series 2002-22, classes II-B-1 and II-B-2. In addition, Moody's has placed 23 classes from seven MBS deals under review for possible upgrade. Moody's attributed the negative rating actions to cumulative losses on the underlying loans that have exceeded the rating agency's original expectations. Moody's can be found online at http://www.moodys.com.
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