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 DURING MASTER CAUTION RECAL AFTER ENGINE START CHECK LIST. QRH PROCEDURES ACCOMPLISHED VERIFIED BACK UP OPS NORMAL, OCCURED ZERO MORE ENROUTE. GROUNDED - YES. ACCOMPLISHED PACK TEMP CONTROL BITE IAW B737-800 FIM 21-61 TASK 801. FOUND FLT DECK TRIM AIR VALVE FAULT ON PREVIOUS LEG. FLT DECK TRIM AIR VALVE OPS CHECK GOOD IAW FIM 21-62- TASK 832.