As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ILLUMINATED ON RECALL. EXTINGUISHED WHEN MASTER CAUTION YELLOW LIGHT IS RESET. TEMPERATURE IS CONTROLLABLE. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONT BITE TEST REF B737-800 AMM 21-61-00. FOUND FLT DECK TRIM VALVE FAULTY. REMOVED AND REPLACED FLT DECK TRIM VALVE REF AMM 21-61-21. RE-RUN BITE TEST, PASS. OPS CK GOOD, LEAK CHECK GOOD.