The Federal Housing Finance Agency should “expeditiously finalize” its long-awaited analysis as to whether Fannie Mae and Freddie Mac will be allowed to offer principal forgiveness modifications under the Treasury Department’s Home Affordable Modification Program, according to the Government Accountability Office. In a report issued late this week, the GAO reminded the FHFA that the Obama administration’s loan modification program, which would be used to implement any principal reductions, expires at the end of December 2013.