As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE BASE MAINTENANCE TEAM REPORTED THE CABIN TEMP CONTROL VALVE STUCK IN FULL HOT. TROUBLESHOOTING REVELED THE CABIN TEMP CONTROL VALVE WAS DEFECTIVE AND WAS REPLACED WITH AN OVERHAULED UNIT. OPS AND LEAK CHECKS WERE SATISFACTORY AND RETURNED THE AIRCRAFT TO SERVICE