As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO-MODE FUNCTION OF FLIGHT DECK IS NOT ABLE TO MAINTAIN A DESIRED TEMP, VARIES BETWEEN 170-28C. PERFORM FIM 21-61 FAULT TREE 912 PERFORM ZONE TEMP CONTROLLER TEST CONDITION. NORMAL. NO FAULT FOUND. CLEANED FLIGHT DECK TEMP SENSOR FILTER AND AUTO-MANUAL MODE OPERATION FLIGHT DECK CONTROL SWITCH CONDITION BACK TO NORMAL. CHECK NO FAULT FOUND. IAW AMM 21-61-03.