What was found
DURING CRUISE, AT FL410 AMBER ELECTRICAL FAULT EICAS ILLUMINATED W/BOTH BATTERIES & BOTH GENS SHOWING FAILED & OFFLINE. FAILURE LASTED FOR MINUTES THEN EXTINGUISHED & RETURNED TO NORMAL. OCCURED AT LEAST 3 TIMES IN FLT & AGAIN DURING LANDING. CREW FOLLOWED UNEXPECTED ELCTRICAL INDICATIONS QRH, DESCENDED BELOW FL300 & 285 KIAS & STARTED APU. EMERGENCY DECLARED & NORMAL LANDING ACCOMPLISHED. R & R LDCPC PN:975GCO2Y07 SN:188R WITH SUPPLIED MODIFIED LDCPC PN:975GCO2Y08, SN:143R. PERFORMED WIRING CHECKS AND OPS CHECKS WITH NO DEFECTS NOTED. ALL OPS CHECKS WERE GOOD. ALL WORK WAS ACCOMPLISHED IN ACCORDANCE WITH AMM 24-61-01.