LL SERVICE BULLETIN MOS 24 (s) GUARD INSTALLATION FOR THE CIRCUIT BREAKERS FOR THE OVERWING DOOR FLIGHT LOCKS. SERVICE BULLETIN RECOMMENDED MOS STANDBY POWER CONTROL UNIT (SPCU) TRAY BRACE AND TRAY STIFFENER ASSEMBLY INSTALLATION.. SERVICE RECOMMENDED BULLETIN 26-FEB-2004 MOS SB 737-24-1155 RI STANDBY POWER CONT