As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL AFT CAB ZONE TEMP LIGHT ILLUMINATES. GROUNDED - YES. PERFORMED BITE OF #1 PACK TEMP CONTROLLER FOUND AFT ZONE TRIM VALVE FAULTING REF B737-900 FIM 21-62 TASK 801. REMOVED AND REPLACED AFT ZONE TEMP CONTROL VALVE REF B737-900 AMM 21-61-21 OPS CHECK AND LEAK CHECK GOOD.