Two tranches of CSFB Mortgage-Backed Pass-Through Certificates, series 2001-11, have been downgraded by Moody's Investors Service.Class C-B-1 was downgraded from Aaa to Aa2, and class C-B-2 was downgraded from Aa2 to Baa2. "The pools backing these securities have a very low pool factor of less than 1%, and include only five remaining loans, one of which is delinquent and another of which is in foreclosure," the rating agency said. On July 25, three subordinate tranches were fully written down due to loss, and class C-B-4 took a $4,000 writedown. "Today's action is a result of these writedowns, and also reflects the continued threat posed by remaining delinquencies in the pool which, although substantially covered by mortgage insurance, may see further high severities," Moody's said. The rating agency can be found online at http://www.moodys.com.

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