As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL, CABIN CONTROL ZONE TEMP LIGHT ILLUMINATED. EXTINGUISHED ON RESET. RESET NORMALLY. GROUNDED - YES. RELEASED PER MEL 21-21G. FLT DECK PRIMARY TEMP CONTROL INOP. REF SDR ON LOG PAGE 121633349 CONTROL CABIN TRIM VALVE REPLACED. ZONE TEMP CONTROLLER BITE OK WITH NO FAULTS REF B737-800 AMM 21-61-00. REMOVED MEL 21-21G.