What was found
FLT 787 JFK-SXM, AIR TURNBACK DUE TO MULTIPLE CIRCUIT BREAKER / RELAY CYCLES (HEARD AUDIBLY) FOLLOWED BY MULTIPLE ECAM WARNINGS. AUTOMATION FAILURES AND LOSS OF CAPT AND F/O PFD AND ND. ALL SYSTEMS RESTORED AFTER RELAYS STOPPED CYCLING. FOUND WIRE INSULATION CHAFED PIN 14 ON CONNECTOR B FROM IDG (PMG). REPAIRED IAW 70-71-22-00. PERFORMED BITE CHECKS FOR GCU 1 AND GCU 2 NO FAULTS FOUND. REMOVED AND REPLACED CONTACTOR RELAY 9XU2, 11XU2, 4XU2, GCU 2, IDG 2, 30XU2 AND BUS TIE SWITCH. PERFORMED WIRING CHECK AND SYSTEM CHECK NORMAL.