As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP: CABIN FILLER WITH SMOKE - RESET - TEMP STARTED DOWN - TEMP TO 36 SMOKE AGAIN. T/S SYSTEM ORDERED ZONE TEMP CONTROLLER DEFERRED TRIM AIR SYSTEM MEL 21-61-9B CATC. INSPED TRIM AIR DUCTS AND VLVS. NO DEFECTS NOTED. FAULTY ZONE TEMP CONTROLLER