As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT, FOUND AFT CAB TEMP CONT INOP LIGHT ON. PERFORMED BITE CHECK ON TEMP CONTROLLERS AND PACK CONTROLLERS. CLEARED FAULTS AND PERFORMED CONTROLLER FAULT VERIFICATION. NO FAULTS NOTED AT THIS TIME AND OPS CHECK GOOD IAW AMM 21-51-00.