As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH AFTER LANDING GEAR EXTENSION, THREE RED LANDING GEAR INDICATION LIGHTS ILLUMINATED. CYCLED LANDING GEAR HANDLE AND ALL INDICATIONS NORMAL. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT MAIN LANDING GEAR DOOR PROXIMITY SENSOR (33GA) AND OPERATIONAL CHECK OK.