As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ON APPROACH DURING INITIAL GEAR EXTENSION, NOSE LANDING GEAR UNSAFE LIGHT ILLUMINATED. CREW ACCOMPLISHED GO AROUND AND SUBSEQUENT GEAR EXTENSION WAS NORMAL. FLIGHT LANDED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NOSE GEAR LOCKED SENSOR D1-3L. SYSTEM GROUND CHECK NORMAL OPERATION.