What was found
MOMENTARY LOSS OF ALL ELECTRICAL COMPONENTS PWR CYCLED TWICE SUSPECT GCU 2, REF FIM 24-13-00-810-809, SN5170 HAS FAULT HISTOR Y. REF TROUBLESHOOTING ON LOG PAGE 4726610, REMOVED AND REPLACED RIGHT GCU PER AMM 24-22-02-401. RAN #2 ENGINE ISOLATED AND POWERING BOTH BUSES UNDER VARIOUS LOADS. NO DEFECTS NOTED. VOLTS AND FREQS NORMAL. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1336301 SN OFF 5170 UNIT, GENERATOR OFF 23-2422-9-0001 5170 ON 23-2422-9-0001 4835