WASHINGTON, DC-As it said it would last month, the US Department of Housing and Urban Development has widened its defaulted mortgage pool program and will begin accepting bids from investors interested in acquiring pools of defaulted mortgages. DebtX, on behalf of SEBA Professional Services, is taking an eye-popping $1.7 billion portfolio of non-performing residential loans to market under the program, called the Distressed Asset Stabilization program.