As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ILLUMINATES ON MASTER CAUTION RECALL. LIGHT EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. REF B737-800 FIM 21-62 TASK 842, #2 PZTC PREV FLT LOGGED FLT DECK TRIM VALVE FAULT, PZTC BITE VERIFY TESTED GOOD W/O FAULTS. VERIFIED BOTH PACKS OPS CHECKED NORMAL ON GND IN ALL TEMPERATURES RANGE.