R G MORTGAGE CORPORATION and R-G Premier Bank of Puerto Rico, Plaintiffs, Appellees, v. FEDERAL HOME LOAN MORTGAGE CORPORATION, Defendant, Appellee. Doral Bank, Putative Intervenor, Appellant. No. 08-2542.United States Court of Appeals, First Circuit.Heard September 16, 2009. Decided October 1, 2009. Appeal from the United States District Court for the District of Puerto Rico, Jay […]