Reducing monthly payments to a sustainable level for distressed borrowers who are significantly underwater on their mortgages may require principal reductions, in addition to interest rate concessions and loan term extensions, but pursuing such a policy is not without significant drawbacks, according to a Federal Reserve analysis. In a white paper sent to the banking committees on Capitol Hill last week, the Fed dove into the controversial issue of whether Fannie Mae and Freddie Mac should be taking more aggressive steps like principal reduction to help distressed borrowers and shore up...