As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK ZONE TEMP ILLUMINATED ON CONT CAB EXTINGUISH DURING RESET. GROUNDED-YES. PERFORMED PACK TEMP CONTROLLER BITE, REF B737-900 FIM 21-62 TASK 801 FOUND NR 2 PTC FAULT "FLT DECK TRIM VALVE". REMOVED AND REPLACED THE CONTROL CABIN TRIM AIR VALVE, REF B737-900 AMM 21-61-21. OPERATIONS CHECK GOOD. NO LEAKS NOTED. NO FAULTS NOTED.