What was found
ON APPROACH, THE RIGHT MAIN GEAR GREEN LIGHT FAILED TO ILLUMINATE. MISSED APPROACH CALLED OUT AND MANUAL GEAR EXTENSION WITH NO RIGHT GREEN LIGHT STILL A FLY-BY WAS DONE AND THE RIGHT GEAR DID APPEAR TO BE DOWN. ON THE MISSED APPROACH THE GEAR WAS RETRACTED AND A SECOND MANUAL EXTENSION DONE WITH A GREEN DOWN LIGHT ILLUMINATING THIS TIME FOLLOWED BY A NORMAL LANDING AND ROLL OUT. INSPECTED DOWN AND LOCK SWITCH, SPRAYED CANNON PLUG WITH CONTACT CLEANER, CHECKED SERVICEABLE.