What was found
FLT 2019 - ABQ-PHX, NO CLIMB-OUT, SHORTLY AFTER FLAP RETRACTION, EXPERIENCED DIFFERENTIAL FAULT IN NR 2 SYSTEM IN COMBINATION WITH ESSENTIAL POWER LOSS AND OVER EXCITATION IN SYSTEMS 1 AND 3, WHICH RESULTED IN THE LOSS OF THE SYNCHRONIZING BUS. AIRCRAFT MADE AN UNEVENTFUL LANDING IN ABQ. INSTALLED VOLTAGE REGULATOR AND GCU AND APU ELECTRICAL SYSTEM INTO NR 2 VOLTAGE REG AND GCU. OPS CHECKS NR 1 AND NR 2 AND NR 3 SYSTEMS AND COULD NOT FIND ANY FAULTS WITH ESSENTIAL POWER SYNCRO OR DIFFERENTIAL FAULT ELECTRICAL SYSTEM. AIRCRAFT WAS RETURNED TO SERVICE. (M)