As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP H (CONT CABIN) ILLUMINATED, DID NOT RESET WITH QRH PROCEDURE. GROUNDED - YES. PERFORMED PTC BITE REF B737-800 FIM 21-62 TASK 801 FOUND #2 PZTC FAULTING "FLT DECK TRIM VALVE". CONTROLLER WOULD NOT RESET C/B RESET NO HELP. REPLACED CONTROL CABIN TEMPERATURE CONTROL VALVE PERB737-800 AMM 21-51-10 OP CHECKS GOOD AT THIS TIME. BITE CHECK CLEAR OF FAULTS AT THIS TIME.