What was found
ACFT EXPERIENCED AN AIR PACK NR 2 FAULT ON CLIMBOUT. THE NR 1 PACK HAD BEEN PREVIOUSLY DEFERRED IAW MEL 21-52-01-07 AND LOCKED OUT. THE FLIGHT CREW FOLLOWED FCOM AND QRH PROCEDURES AND DIVERTED. THE ACFT NEVER LOST CABIN PRESSURE. UPON ARRIVAL, TECHS REPAIRED THE NR 1 PACK BY REPLACINGTHE REGULATOR IAW AMM 21-51-51 PB 401 AND REPAIRED THE NR 2 PACK BY REPLACING THE ACSC IAW AMM 21-61-34- PB401. THE ACFT WAS RETURNED TO SERVICE AND DEPARTED, NO PACK RELATED FAULTS NOTED ON SUBSEQUENT FLIGHTS.