As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT DECK TEMP CONTROL ZONE TEMP LIGHT ILLUMINATES ON MASTER CAUTION RECALL. EXTINGUISHES WITH M.C. RESET. GROUNDED - YES. VERIFIED CONTROL CABIN ZONE TEMP ILLUMINATES ON RECALL. PERFORMED PZTC BITE, PZTC #2 FAULTED CONTROL CABIN TRIM VALVE ON BIT AND PREV FLIGHT, RESET ON VERIFY. CONFIRMED CONTROL CABIN TRIM VALVE OPERATES NORMALLY ON SUBSEQUENT PZTC TESTS. ETOPS GROUND VERIFICATION SUCCESSFUL.