As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR CONDITIONING AND ZONE TEMP LIGHT ILLUMINATED. MASTER CAUTION PRESSED LIGHTS GO OUT. CONTROL CABIN ZONE LIGHT DOES RESET WITH MASTER CAUTION RESET. ACFT GROUNDED. REMOVED AND REPLACED A FAULTED CONTROL CABIN ZONE TRIM AIR MODULATING VALVE IAW AMM 21-61-21. FAULT CLEARED ON THE PACK/ ZONE TEMP CONTROLLERS, OPS AND LEAK CHECKED GOOD.