As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CAB TEMP CONTROL VERY ERRATIC IN AUTO, WORKS WELL IN OFF. ACFT GROUNDED. CLEANED FWD CABIN TEMPERATURE SENSOR REF AMM TASK 21-61-10-100-801; ACCOMPLISHED BITE CHECK OF BOTH TEMP CONTROLLERS. NO FAULTS REF 21-61-00-700-806-002; RAN AIR CONDITIONING SYS WITH BOTH PACKS-FWD CABIN TEMP CONTROL WAS NORMAL IN AUTO AND OFF SETTINGS, REF. AMM FIM TASK 2161-864 F.4.