What was found
FLT 523 EWR-MCO, CREW DECLARED EMERGENCY DUE TO DURING CRUISE ELEC MALFUNCTIONS CAUSED NUMEROUS FAULTS INCLUDING SEC 3, FAC 2, F/O PFD, F/O ND, LWR ECAM, COCKPIT DOOR, CABIN LIGHTING, LIVE TV. ALL OF THESE ITEMS FLICKERED ON/OFF NUMEROUS TIMES. THE ECAM ACTIONS DROVE CREW TO RESET SEC 3 WHICH RESULTED IN FURTHER FAILURES INCLUDING SEC 2. T/S FOUND THE NR 2 GCU AT FAULT. REMOVED AND REPLACED THE NR 2 GCU (1XU2) IAW 24-22-34. REMOVED AND REPLACED THE NR 2 GENERATOR CONTACTOR (9XU2) IAW 24-22-55, OPS CK NORMAL IAW 24-22-00. PERFORMED SYS OP CHECKS ON: SEC 1, 2, 3 IAW 27-96-00. THE COCKPIT DOOR IAW 52-51-00. THE F/O`S EIS IAW 31-60-00. THE CABIN LIGHTS IAW 33-20-00 AND LVTV IAW 23-39-00. ALL CHECKED NORMAL.