As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TUS - CREW REPORTED LOWERED GEAR AND GOT ALL 3 GREEN, BUT ON FINAL GOT GEAR WARNING HORN AND UNSAFE LIGHT ILLUMINATED. RECYCLED GEAR AND WARNING INDICATION REMAINED. EMERGENCY DECLARED FLIGHT LANDED TUS WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED RIGHT GEAR DOWN AND LOCK SENSOR D-127. SYSTEM GROUND CHECK NORMAL OPERATION.