As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP LIGHT ILLUMINATES ON RECALL. GROUNDED-YES. ACCOMPLISHED PACK/ZONE TEMPERATURE CONTROLLER BITE, PER B737-900 AMM 21-61-00-700-806-802, FLIGHT DECK TRIM VALVE FAILED. REMOVED AND INSTALLED NEW CONTROL CABIN TRIM VALVE, PER AMM 21-61-21/401. NO FAULTS FOUND. GROUND VERIFICATION SUCCESSFUL.