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 ON RECALL, RESET WITH MASTER CAUTION RESET. GROUNDED - YES. REF B737-900 FIM 21-62 TASK 842 #2 PZTC PREV FLT LOGGED "FLIGHT DECK TRIM VALVE" FAULT, FAULT RESETTABLE. VERIFIED BOTH PACKS OPS CHECKED NORMAL IN ALL TEMP RANGE W/O FAULTS. 1&2 PZTC BITE TEST GOOD W/O FAULTS.