What was found
CLT FLT1577 AFTER TAKEOFF FROM CLT, CREW REPORTED THE FIRST OFFICER’S GYRO AND IRU FAILING INTERMITTENTLY. ALSO, THE NR 2 AND NR 3 TRANSFORMER/RECTIFIER CIRCUIT BREAKERS WERE TRIPPED. FLIGHT RETURNED TO FIELD AT CLT AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE RESET THE NR 2 AND NR 3 TRANSFORMER/RECTIFIER CIRCUIT BREAKERS. OPS CHECK NORMAL. NO FAULTS NOTED. REMOVED AND REPLACED NR 2 AND NR 3 TRANSFORMER/RECTIFIERS, AS PRECAUTIONARY PER MM 24-21-31. FIRST OFFICER’S TRANSFORMER/RECTIFIER OPERATE PROPERLY PER MM 34-28-00. FURTHERMORE, FOUND PINS/SOCKETS BURNED ON NR 2 ENGINE PYLON CONNECTORS D3026 AND D410 DUE TO A SUBSEQUENT EVENT THE FOLLOWING DAY. REPLACED CONNECTORS. ACCOMPLISHED AC GENERATION SYSTEM TEST PER MM 24-21-00. CHECKS O.K.