Two tranches from CSFB Mortgage-Backed Pass-Through Certificates series 2001-11 have been downgraded by Moody's Investors Service, and two tranches have been placed under review for possible downgrade.Class C-B-3 was downgraded from A2 to Caa1, and class C-B-4 was downgraded from Ba2 to C, while classes C-B-1 and C-B-2 were placed under review. On July 25, three subordinate tranches of the deal were fully written down due to a loss on one loan, and class C-B-3 took a $4,000 writedown, Moody's reported. "Today's actions are the 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," the rating agency said.

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