What was found
T/O ROLL NR 4 DU BLANKED, NR 1 FMS DISP "TIMEOUT RESELECT" NR 3 MCDU BLANKED, OCCURRED PRIOR TO V, CONTINUED T/O. AT 180 NM FROM HNL RECEIVED MANY LVL 1 AND LVL 2. ALERTS MOST SIGNIFICANT LVL 1 "BUS AC 1 OFF" AND LVL2 FUEL QTY FAULT", LVL 2 SELECT FADEC ALTN". AUX IRU WENT TO "BATT" AND FAILED 20 MINUTES LATER. NR 1 FMS WENT TO STBY. DUMPED 120K FUEL. RETURNED TO HNL. NR 1 AC BUS REPOWERED ITSELF PRIOR TO APPROACH AND ALL DU CONTINUED TO FLICKER OFF/ON DURING APPROACH. AVIONICS RACK FAN C/B POPPED AND CAC FAN C/B. REMOVED AND REPLACED SENSE RELAY R2-5071, NO JOY. REMOVED AND REPLACED NR 1 GCU. OPS CHECK GOOD. REMOVED AND REPLACED NR 1 APR AND RAN ENGINES. EPCU CURRENT FAULTS SENSE RELAY STILL THERE. REMOVED AND REPLACED RCCB B1-174, OPS CHECK GOOD AND FAULT GONE. RAN ENGINES, CHECK GOOD.