As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, THE CABIN TEMPERATURE CLIMBED TO AN UNCOMFORTABLE LEVEL. USE OF MANUAL CABIN TEMPERATURE MODE DID NOT CORRECT THE PROBLEM. T/S REVEALED THAT THE CABIN TEMPERATURE CONTROL VALVE TORQUE MOTOR WAS STUCK. REMOVAL AND REPLACEMENT OF THE TORQUE MOTOR WITH AN OVERHAULED UNIT CORRECTED THE PROBLEM.