8-069 REV. A FUEL SYSTEM MOTOR OPERATED VALVE ACTUATORS. SERVICE LETTER 05-DEC-2008 MOS SL 737-SL-28-070 GROUND FAULT INTERRUPT (GA) RELAYS FOR THE FUEL BOOST PUMP. SERVICE LETTER MOS 24-JUL-2007 SL 737-SL-28-070 REV. A GROUND FAULT INTERRUPT (GFI) RELAYS FOR THE FUEL BOOST PUMP. SERVICE LETTER MOS 27-MA