As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED FLIGHT, GTC FIRE LIGHT ILLUMINATED DURING DESCENT. TEE HANDLE PULLED, LIGHT REMAINED ILLUMINATED. DISCHARGED THE FIRE EXTINGUISHER, LIGHT WENT OUT MOMENTARILY AND THEN ILLUMINATED AGAIN. LOADMASTER VISUALLY VERIFIED NO SMOKE OR FLAMES. ON LANDING, INSPECTED GTC FOR ANY SIGN OF FIRE, AND FOUND NONE. COMPONENT CAUSING MALFUNCTION UNKNOWN.