As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED GEAR DOOR INDICATION ON TAKEOFF. GEAR DOOR AMBER INDICATION WAS ON WITH GEAR RETRACTED AND OFF WITH GEAR EXTENDED. CREW CYCLED GEAR SEVERAL TIMES NO HELP. FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED K10267 RELAY AND ELECTRONIC PROXIMITY SWITCHING UNIT. SYSTEM GROUND CHECK NORMAL OPERATION.