What was found
(CAN) DEPARTED WITH MEL ON NR 2 GENERATOR, GENERATOR HAD BEEN DISCONNECTED. 50 MILES SOUTH WEST OF YQB, THE APU GENERATOR FAILED. NR 1 BUS TRANSFER DID NOT TAKE PLACE, FIRST OFFICER WAS WITHOUT INSTRUMENTS. REQUESTED LANDING TO YQB, LANDED WITHOUT INCIDENT. APU GENERATOR CONTROL UNIT CIRCUIT BREAKER HAD TRIPPED. REPLACED GCU AS PER WORK CARD 2271-2. OFF CANADIAN PART 7-2450-9-0001, SERIAL 0758, ON SERIAL 2847. OFF CANADIAN PART #7-2450-9-0002 SERIAL 0776, ON S/N 1112.