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 FINAL APPROACH, LIGHT EXTINGUISHED ON MASTER CAUTION RESET. REPLACED AFT CABIN TRIM AIR VALVE IAW AMM 21-61-21. PERFORMED ZONE BITE TEST OF BOTH CONTROLLERS IAW 21-61-00, ZONE TRIM FAULT LIGHT EXTINGUISHED & BOTH OPS NORMAL. AFT CABIN ZONE TEMP ANNUNC IN COCKPIT NO LONGER ILLUMINATES W/MASTER DIM RECALL. RAN BOTH ACFT SYSTEMS IAW AMM 21-61-21 & PERFORMED LEAK CHECK IN AREA OF REPLACED TRIM VALVE, NO LEAKS NOTED. GROUND VERIFICATION SUCCESSFUL.