As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED EXCESSIVE HEAT IN COCKPIT AIR SUPPLY AND HAD NO CONTROL IN AUTOMATIC OR MANUAL MODE OF TEMPERATURE CONTROL SYSTEM. DURING INVESTIGATION OF THE DISCREPANCY THE COCKPIT TEMP CONTROL VALVE WAS FOUND TO HAVE MECHANICALLY FAILED IN THE FULL HOT POSITION. THE VALVE WAS REPLACED AND RECTIFIED THE DISCREPANCY.