As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP LIGHT ON CONT CAB ILLUMINATED ON RECALL AFTER PUSH/ENGINE START. PERFORMED QRH PROCEDURE. NO EXCESSIVE CABIN HEAT NOTED AND CABIN TEMP CONTROL STILL RESPONDS NORMALLY. GROUNDED-YES. RAN BITE CHECK FOR ZONE TEMP CONTROLLERS 1 AND 2. INITIALLY FAULTED FLIGHT DECK TRIM VALVE, BUT FAULT CLEARED, PER B737-800 AMM 21-61-00-700-806-002.