As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT ZONE TEMP ILLUMINATED ON RECALL EXTINGUISHES ON MASTER CAUTION RESET. AFT ZONE MODULATING VALVE STUCK OPEN DUE TO ZONE TEMP CONTROL VALVE FAULTY. VALVE ASSY ZONE TEMP CONT IPC 21 62 01 03 ITEM 10. 3214972 1. REMOVED & REPLACED TRIM AIR PRESSURE REGULATING & SHUT OFF VALVE REF MM 21 62 01 400 801. ALL OPS & LEAK CHECKS GOOD. NO FAULTS OR LIGHTS AFTER OPS CHECKS.