As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT,THE CREW NOTICED THAT THEY COULD NOT LOWER THE FLIGHT COMPARTMENT TEMPERATURE. MAINTENANCE TRACED THE PROBLEM TO A SEIZED ACM. THE ACM, HEAT EXCHANGER, AND CONDENSER/MIXER WERE REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.