As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) APPROXIMATELY 1 HR AFTER DEPARTURE WITH AIR CONDITIONING PACK 2 UNDER MEL THE CREW RECEIVED A PACK 1 OVERHEAT MESSAGE. A MAYDAY WAS DECLARED AND AN EMERGENCY DESCENT FROM FL360 TO 10000FT WAS CARRIED OUT. THE PASSENGER OXYGEN MASKS DID NOT DEPLOY AND THE FLIGHT DIVERTED AND LANDED BELOW MAXIMUM LANDING WEIGHT. RAM AIR INLET ACTUATOR REPLACED IAW AMM 21-61-51, PB401.