As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED NOSE GEAR UNSAFE INDICATION ILLUMINATED WITH GEAR HANDLE IN UP POSITION. FLIGHT RETURNED DFW GEAR EXTENDED AND HAD THREE GREEN DOWN/LOCKED INDICATIONS AND LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SEVICE. REPLACED UPLOCK SENSOR. SYSTEM GROUND CHECKED NORMAL OPERATION.