What was found
INFLIGHT, CREW REPORTED AUTO-PILOT AND AUTO-THROTTLES DISCONNECTED WITH NUMERIOUS CAWS WARNINGS AND HORNS GOING OFF. AIRCRAFT WENT DARK AND EMERGENCY POWER WAS SELECTED. AUXILIARY POWER UNIT CAME ONLINE BUT HAD TO DISCONNECT LEFT GENERATOR FOR APU TO PICK UP BUSSES. EMERGENCY DECLARED, FLIGHT DIVERTED & LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT GENERATOR, LEFT AND RIGHT A/C POWER RELAYS, AND LEFT AND RIGHT GENERATOR CONTROL UNITS. SYSTEM GROUND CHECKED NORMAL.