GMAC Financial Services has written down the value of the riskiest mortgage assets of its mortgage division by 41%, a move that could be a precursor to a sale of the unit.

To date, GMAC has declined to comment on reports that Berkshire Hathaway has shown an interest in Residential Capital Corp. (ResCap), the nation's fourth largest home lender. (Berkshire also has declined to comment.) The risky mortgage assets that were marked down by 41% once had a face value of $9.2 billion.

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