As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED NOSE LANDING GEAR GREEN LIGHT ON APPROACH WENT TO RED WITH AURAL WARNING. ACCOMPLISHED GO AROUND AND TOWER CONFIRMED GEAR WAS DOWN. EMERGENCY DECLARED FLIGHT LANDED DFW WITHOUT INCIDENT. REPLACED NOSE GEAR UP/DOWN SENSOR. SYSTEM GROUND CHECK NORMAL OPERATION.