As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE ENVIRONMENTAL AIR TEMP WAS RUNNING VERY COOL DESPITE SELECTING TEMP CONTROLLER TO "HOT". THE MAINTENANCE VENDOR TROUBLESHOT AND CHECKED THE CABIN AND DUCT TEMP SENSOR RESISTANCE, PERFORMED TEMP SELECT AUTO SWITCH TEST AND PERFORMED WIRING CHECKS WITH NO DEFECTS NOTED. CABIN AND COCKPIT HEAT OPERATIONS CHECKS GOOD. AIRCRAFT WAS RETURNED TO SERVICE.