What was found
SHIP 5635 -ATB- RIGHT HAND ELECTRICAL BUSS FAILED, RAN QRH, WOULD NOT RESET AND REMAINED ISOLATED IN FLIGHT. / CORRECTIVE ACTION: T/S AND FOUND RT GCU UNSECURE, RE-SECURED RT GCU AND INSPECTED KNURL KNOBS, THREADS OK. RAN ENGINE, OPS NORMAL, APU POWER SYSTEM OK.