As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT RECALL THE CONTROL CABIN LIGHT ILLUMINATED AND WENT OUT ON MASTER CAUTION RESET. ACFT GROUNDED. ACCOMPLISHED BITE TEST OF ZONE TEMP CONTROLLERS. NR 2 ZONE TEMP CONTROLLER SHOWED FLT DECK TRIM VALVE. CHECKED 30 DAY HISTORY. NO PREVIOUS FAULTS RECORD. ACCOMPLISHED RESET OF ZONE TEMP CONTROLLER IAW AMM TASK 21-61-00-700-806-002. VERIFIED CONT CAB ZONE LIGHT DID NOT ILLUMINATE ON RECALL.