As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN ZONE TEMP LIGHT ON MASTER CAUTION RECALL, RESETS WITH MASTER CAUTION. AFT CABIN TEMP DID NOT RESPOND TO MOVING CONTROLLER TO FULL HOT OR FULL COLD. GROUNDED - YES. REMOVED AND REPLACED V145 AFT CABIN TRIM MODULATOR VALVE REF B737-800 AMM TASK 21-61-21-000/400-801. OPS NORMAL, LEAK CHECK GOOD.