As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB "ZONE TEMP" CAME ON AT RECALL AFTER ENGINE START. GROUNDED-YES. REF B737-900 FIM 21-62 TASK 842, NR 2 PZTC PREVIOUS FLIGHT FAULT LOGGED FLIGHT DECK TRIM VALVE FAULT. FAULT RESET, BOTH PACKS OPERATIONS CHECKED NORMAL ON GROUND IN ALL TEMPERATURE RANGE. NR 1 AND NR 2 PZTC BITE TESTED NORMAL W/O FAULTS.