As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4019 - DURING APPROACH AND PREPARATION FOR LANDING WHEN SELECTING GEAR DOWN, CREW NOTICED AN UNSAFE GEAR INDICATION ALL 3 LANDING GEAR LEGS. F/O VISUALLY CONFIRMED MAIN LANDING GEARS WERE DOWN AND LOCKED. NO EMERGENCY WAS DECLARED, AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AIRCRAFT AND FOUND A DEFECTIVE DOWNLOCK MICROSWITCH RT MLG - REMOVED AND REPLACED DEFECTIVE COMPONENT. AIRCRAFT RETURNED TO SERVICE.