As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN TEMPERATURE CONTROLLER PRODUCES FULL HOT AIR IN ANY POSITION. WHEN IN OFF POSITION IT MAINTAINS A DUCT TEMPERATURE OF 9 DEGREES C. ACFT GROUNDED. VERIFIED PROBLEM. BITE CHECKED BOTH ZONE TEMP CONTROLLERS IAW AMM 21-61-00. NO FAULTS. VERIFIED CONTROL CABIN SENSOR FAN IS OPERATING & FILTER IS CLEAN. WITH CONTROL CABIN SELECTOR KNOB AT 11:00 POSITION DUCT TEMP DRIVES FULL HOT. REMOVED & REPLACED TEMP CONTROL MODULE P5-17 IAW AMM 21-61-15. OPS NORMAL. CONTROL CABIN TEMP INCREASES & DECREASES SMOOTHLY.