As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN TEMPERATURE ROWS 8-15 EXCESSIVELY HOT. REDUCED TEMP, STILL TOO HOT, TURNED TRIM AIR OFF PER QRH. GROUNDED - YES. RETURNED TRIM AIR TO ON. REPLACED ALL 3 CABIN & FLT DECK TEMP SENSORS FILTERS WITH NEW ONES. REF AMM 21-61-06-400-801.