As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN TEMP CONTROLLER WILL NOT MAINTAIN TEMPERATURE. WITH KNOB AT 2 O`CLOCK TEMP INDICATES 7 DEGREES. C DUCT SUPPLY STABILIZES IN MANUAL MODE. VERIFIED TEMP CONTROL WITH TRIM AIR SWITCH SELECTED OFF. NO FAULTS LOGGED ON CONTROLLERS.