As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CABIN ZONE TEMP LIGHT ILLUMINATED WITH RECALL, EXTINGUISHES WITH MASTER CAUTION RESET. ACFT GROUNDED. REPLACED THE FWD CABIN ZONE TRIM AIR MODULATING VALVE IAW AMM 21-61-21-00-801 AND AMM 21-61-21-400-801. BITE CHECK OF THE PACK/ZONE TEMPERATURE CONTROLLERS PASSES WITHOUT FAULTS. THE NEW VALVE LEAK CHECKED GOOD.