As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT RETURNED TO FIELD AFTER THE CREW WAS UNABLE TO CONTROL THE CABIN TEMPERATURE. THE CREW ATTEMPTED THE UNLATCHING PROCEDURE BUT THE CABIN TEMPERATURE WOULD ONLY COOL TO 25 DEGREES WHEN ON FULL COLD. THE CABIN WOULD THEN INCREASE BACK TO 35 DEGREES AGAIN. MAINTENANCE REMOVED AND REPLACED THE 2161-K1 AND K2 RELAYS. CW OPS CHECK IAW D-8 MM 216000. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.