As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RUNNING AFTER START - ZONE TEMP CABIN CONT ILLUMINATED ON RECALL. RAN QRH, LIGHT WENT OUT ON RESET. GROUNDED - YES. ACCOMPLISHED BITE CHECK OF THE PACK/ZONE TEMP CONTROLLERS USING INSTRUCTIONS ON THE CONTROLLERS. FOUND FLIGHT DECK TRIM VALVE FAULT ON THE NR 2 CONTROLLER, FAULT RESET, INTERMITTENT FAULT ZONE TEMP. LIGHT DOES NOT ILLUMINATE ON RECALL.