Freddie Mac could save millions of dollars a year in faulty reimbursement payouts to its servicers by investing additional resources in a wider selection of reviews, according to an audit issued last week by the Federal Housing Finance Agency’s Office of Inspector General. In 2013, Freddie reimbursed 460 of its servicers $1.4 billion but identified and denied $126 million in what the IG calls “erroneous” claims. The IG noted that Freddie’s top 10 servicers, relative to total reimbursements, accounted for 87 percent of all reimbursements made by Freddie in 2013. Servicers of Freddie and Fannie Mae loans often maintain...