As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH BACK RECEIVED ZONE TEMP CAUTION LIGHT. ZONE TEMP LIGHT EXTINGUISHES ON A RESET CONT CAB CONTROLLER. GROUNDED - YES. PERFORMED PACK TEMP CTRL BITE IAW B737-900 AMM 21-62 TASK 801. FOUND FLT DECK TRIM VALVE ON PACK/ZN CON-R TO BE AT FAULT. PERFORMED B737-900 FIM 21-62 TASK 832. ZONE TEMP LIGHT CTRL CABIN STAYS OFF.