As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT TEMP CONTROLLER WILL NOT HOLD A CONSTANT TEMP. ACFT GROUNDED. PERFORMED A CABIN TEMP CONTROL BITE NR 1 & 2 IAW FIM 21-61, TASK 801. NO FAULTS DURING BITE. REMOVED AND REPLACED THE AFT CABIN TEMP SENSOR FILTER IAW AMM 21-61-06. CABIN TEMPERATURE OPERATES NORMALLY WITH EITHER PACK. OPS CHECKED GOOD.