As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH AFTER EXTENDING THE LANDING GEAR, RECEIVED 'L/G NOT DOWNLOCKED' MESSAGE WITH NOSE LANDING GEAR INDICATING LOCKED AND THE MAIN LANDING GEAR INDICATING UNLOCKED. CYCLED THE LANDING GEAR HANDLE AND ALL INDICATION'S NORMAL. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE RIGHT MAIN LANDING GEAR DOOR CLOSED PROXIMITY SENSOR (28GA), OPS CHECK OK.