What was found
FLIGHT DEPARTED RDU WITH THE NR 1 ENGINE GENERATOR ON MEL 24-1. EN ROUTE CLT, THE NR 2 AND NR 3 TRANSFORMER RECTIFIER UNIT CIRCUIT BREAKERS TRIPPED. THE APU GENERATOR WAS UNABLE TO PICK UP THE RIGHT GENERATOR BUSS AS THE NR 2 ENGINE GENERATOR HAD TRIPPED OFF LINE WITH VOLTS AND FREQUENCIES INDICATING ZERO. FLIGHT LANDED SAFELY WITHOUT INCIDENT AT CLT. MAINTENANCE FOUND PIN -B- ON CONNECTOR D3026 BURNT CAUSING PHASE LOSS. REPLACED CONNECTOR D3026 PER SPWM 20-61-19. OPERATIONAL CHECK OF NR 2 GENERATOR, NR 2 AND NR 3 TRANSFORMER RECTIFIER UNITS AND APU CHECK NORMAL. CLEARED MEL 24-1 ON NR 1 ENGINE GENERATOR WITH THE REPLACEMENT OF THE NR 1 GENERATOR CONTROL UNIT AND A RESET OF THE NR 1 CSD. OPS CK GOOD.