As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DECENT IN TO ELP THE LANDING GEAR WAS EXTENDED, THE RH M/L/G DOWN AND LOCKED GREEN LIGHT DID NOT ILLUMINATE. THE ALTERNATE LANDING GEAR EXTENSION SYSTEM WAS USED WITH THE GREEN LIGHT STILL WAS NOT ILLUMINATED. THE CREW DECLARED AN EMERGENCY AND FLEW BY THE TOWER FOR A VISUAL CHECK OF THE GEAR, ATC REPORTED ALL THREE LANDING GEAR WERE DOWN. A NORMAL LANDING WAS COMPLETED.