What was found
(CAN) NR 2 AC GEN FAILED FAULT ISOLATION CARRIED OUT, IAW Q400 FIM TASK 24-21-00-810-802 FOUND PUSHBACK PIN IN EPCU CONNECTOR 2431-P12 PIN 9 (RIGHT AC V SENSE PHASE B). PIN 9 RESECURED IN EPCU CONNECTOR 2431-P12. GROUND FUNCTION TEST OUTSTANDING. NOTE: FIM TASK 24-21-00-810-802 WAS CARRIED OUT STARTING AT PART 3. IF THE NR 2 AC GEN POWERS THE NR 1 AC BUS. ALL WIRING CHECKS OK. ENGINE RUN CARRIED OUT WITH NO FIX. FAULT CODE 26 ON EPCU PRESENT EVERY TIME RUN WAS CARRIED OUT AND RESET. AGAIN, NR 2 GEN DOES POWER THE NR 1 AC BUS, BUT NOT THE NR 2 BUS. NR 1 AC GEN IS ABLE TO POWER BOTH BUSES IN A CROSSTIE SITUATION. CARRIED OUT WIRING CONTINUITY CHECK OF WIRE NR 20038A-22-2 FROM AC GCU PIN G- AND PIN 79 OF RT AC CONTACTOR BOX NFF, CARRIED OUT CONTINUITY/MEGGER CHECK OF TWO WIRE SHIELDED FROM PIN T & P OF NR 2 AC GCU TO PINS 36 & 37 OF NR 2 AC CONTACTOR BOX AND FOUND PIN T SHORTED TO OWN SHIELD/GROUND, ISOLATED THE SHORT BETWEEN CONNECTOR 9811-P702 PIN V ON THE AFT. WING ROOT DISC TO CONNECTOR P1 PIN 36 OF THE NR 2 AC CONTACTOR BOX REQUIRES FURTHER TROUBLESHOOTING TO FIND LOCATION OF SHORT, SHORT BETWEEN CONNECTOR 9811-P702 PIN V AND CONNECTOR P1 PIN 36 LOCATED AT THE WING ROOT CLAMP. WIRE TRACED TO WING ROOT CLAMP. FURTHER ACTION REQUIRED. SHORTED WIRE (CODED W20043A-20-2) BETWEEN CONNECTOR 9811-P702 PIN V AND CONNECTOR P1 PIN 36 SPLICED AND REPLACED FROM DAMAGED AREA, IAW WM 20-16-20. WIRING TEST CARRIED OUT, IAW AMM TASK 20 8722,30 8722,11 8722,760 8722,801 WITH NO FAULTS FOUND. GROUND FUNCTION TEST OUTSTANDING. ENGINE RUNS CARRIED OUT FOR A/C GENERATION OPS CHECK. CARRIED OUT SERVICEABLE, AS PER TASK 24-31-11-743-802. (TC# 20180103008)