As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CAPTAIN ADVISED DISPATCH THAT AT 500FT AGL THE LANDING GEAR WAS IN QUESTION. FLIGHT ABORTED APPROACH. THE CREW DECLARED AN EMERGENCY DID FLY BY OF THE TOWER AND WAS ADVISED THAT THE GEAR LOOKED OK. FLIGHT LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED R2-1 RELAY FOR GROUND POSITION WARNING SYSTEM. SYSTEM GROUND CHECK NORMAL OPERATION.