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 ILLUMINATED WITH MASTER CAUTION RECALL EXTINGUISHES WHEN MASTER CAUTION SYSTEM IS RESET. ACFT GROUNDED. PERFORMED PACK TEMP CONTROL BITE PROCEDURE FIM 21-62 TASK 801. LT PACK ZONE TEMP CONTROLLER SHOWS TRIM VALVE FAULT. RESET FAULT, AFT CABIN ZONE TEMP LIGHT REILLUMINATED ON RECALL WHILE RUNNING PACKS. REPLACED THE AFT PASSENGER COMPARTMENT TRIM AIR VALVE IAW AMM 21-61-21. LEAK AND OPS CHECKED GOOD.