As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, LANDING GEAR INDICATOR SHOWED 3 GREEN LIGHTS AND RIGHT MAIN UNSAFE LIGHT. DECLARED AN EMERGENCY. FOLLOWED REQUIRED PROCEDURE AND AIRCRAFT LANDED WITHOUT INCIDENT. CORRECTION: REPLACED LANDING GEAR ACCESSORY UNIT. TESTED RIGHT MAIN LANDING GEAR DOWNLOCK SENSOR. OPERATIONAL CHECK GOOD.