What was found
RTF DUE TO NR 2 PACK ECAM FAULT MSG AND NR 1 PACK ALREADY DEFERRED. NR 2 PACK OVERHEAT WAS REPORTED WITH NR 1 PACK ALREADY DEFERRED. NR 2 PACK FAULT DISPLAYED ON THE UPPER ECAM SCREEN. REMOVED AND REPLACED NR 2 ACM (MR21552), 11HM1, PER MM-21-52-21. OP-CHECK AND LEAK CHECK WAS GOOD. FOLLOWING REPLACEMENT OF ACM, TWO DAYS LATER, THE DIFFERENTIAL PRESSURE SENSOR 9HB (PCN 565-2246) WAS REPLACED PER MM 21-51-11. OP-CHECK GOOD, NO MESSAGES OR FAULTS.