What was found
CREW REPORTED LOSING NUMBEROUS ELECTRICAL BUSSES. DIVERTED ACFT. NR 1 FAIL LOST TCAS, WINDOW HEAT, FUEL PUMPS, ELEC HYD NR 1 APU COULD NOT POWER ACFT BUT RUNS COULD NOT ACCEPT GROUND POWER. REPLACED THE NR 1 AND APU GENERATOR CONTROL UNITS IAW AMM 24-21-81. REPLACED BPCU IAW AMM 24-41-21. RAN BOTH ENGINES AND APU WHILE SWAPPING AC POWER SOURCES. ALL ACFT SYSTEM APPEAR NORMAL AND CONNECT AND DISCONNCT FROM AC BUSSES. PERFORMED LIGHTNING STRIKE INSPECTION, NO FINDINGS. ALL OPS CHECKED GOOD