As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CAB ZONE TEMP LIGHT ILLUMINATED ON RECALL. RAN QRH CHECKLIST, LIGHT STILL ILLUMINATES ON RECALL. GROUNDED - YES. FOUND NR 1 TEMP CONTROLLER WITH ZONE TRIM VALVE FAULT. REMOVED AND REPLACED AFT CABIN ZONE TEMP CONTROL VALVE TRIM MODULATING PER AMM 21-61-21. LEAK CHECK GOOD AND BITE CHECK GOOD.