As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ERRATIC AIR TEMP INDICATIONS IN CABIN FWD AND AFT. FLUCTION BETWEEN 25C AND 70C. ACTUAL CABIN TEMP REPORTED OK. SUPPLY DUCT TEMP APPEARS NORMAL. ACFT GROUNDED. CLEANED CABIN TEMP SENSOR FILTERS REF 21-61-06-100-801. INDICATION NORMAL REF 21-61-32-400-801, SUBTASK 21-61-32-860-001.