Classes A-1 and A-2 of Diversified Asset Securitization Holdings I LP have been downgraded from BB to B/DR1 by Fitch Ratings.The downgrades stem from continued deterioration in the quality of DASH I's collateral portfolio, the rating agency said. DASH I is a collateralized debt obligation that was originated and managed by Asset Allocation & Management LLC, which closed Dec. 18, 1999, Fitch said. The portfolio backing the CDO consists of residential and commercial mortgage-backed securities, asset-backed securities, and other CDOs.

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