What was found
(CAN) FLIGHT DISPATCHED UNDER MEL 21-25-01 A1 NR 1 PACK INOPERATIVE. AFTER DEPARTURE, THE FLIGHT EXPERIENCE A NR 2 PACK FAILURE. A PHONE PATCH WAS ESTABLISHED WITH MAINTENANCE CONTROL AND A RESET WAS NOT ABLE TO BE ACCOMPLISHED. IN CONSULTATION WITH SOC, MAINTENANCE AND DISPATCH, THE FLIGHT ELECTED TO RETURN TO POINT OF DEPARTURE WHERE AN OVERWEIGHT LANDING OF APPROXIMATELY 10,000 KGS OCCURRED. P2 COMP OVERHEAT SENSOR 35HH FAULTED BY THE TEMP CONTROLLER. COMP OVERHEAT SENSOR 35HH REPLACED IAW AMM 21-61-12 PB401. PACK OPERATION CARRIED OUT. CHECKED SERVICEABLE. TEMP SENSOR, PN: B7280.