As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW NOTICED AMBER ''CREW'' LIGHT ON IN-FLIGHT AND AMBER ''PAX'' LIGHT ON UPON LANDING. CREW DEFERRED MANUAL MODE PER MEL 21-14. RELOCATED AIRCRAFT TO AGS. GARRETT AVIATION FOUND A FAILED COCKPIT TEMPERATURE CONTROL VALVE IN THE AIR CONDITIONING SYSTEM. REPLACEMENT OF THE VALVE WITH A REPAIRED UNIT AND OPERATIONAL CHECK PERFORMED. (X)