Federal prosecutors on Tuesday charged two former managers at Serra Nissan in connection with a conspiracy at the Birmingham car dealership to boost loan approvals and car sales fraudulently, announced U.S. Attorney Joyce White Vance, IRS Criminal Investigation Special Agent in Charge Veronica Hyman-Pillot and FBI Special Agent in Charge Richard D. Schwein Jr. The U.S. Attorney's Office filed a three-count information in U.S. District Court charging former Serra Nissan sales manager Gerald R. Shepard, 56, of Pinson, with conspiracy, bank fraud and subscribing to a false tax return.