As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP LIGHT ILLUMINATED ON MASTER CAUTION RECALL. MASTER CAUTION RESET EXTINGUISHED ZONE TEMP AND AIRCOND ANNUNCIATOR. GROUNDED - YES. RELEASED PER MEL 21-21G FLIGHT DECK PRIMARY TEMP CONTROL INOP. #2 ZTC SHOWED FLT DECK TRIM VALVE FAULT. PERFORMED BITE VERIFY ON BOTH ZTC CONTROLLERS, NO FAULTS NOTED. FAULT RESET REF B737-900 FIM 21-62 TASK 842. THIS CLEARS MEL 21-21G.