As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - FLT 2735 - UPON GEAR EXTENSION INTO BWI, CREW RECEIVED THREE GREEN AND THREE RED GEAR LIGHTS. CREW ENSURED GEAR HANDLE WAS IN DOWN DETENT. AFTER RECYCLING GEAR, CREW RECEIVED NORMAL THREE GREEN GEAR LIGHTS AND NO RED LIGHTS. FLIGHT LANDED AT BWI WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR LEVER SWITCH (P/N MS25383-1) AND THE LANDING GEAR ACCESSORY UNIT. PERFORMED GEAR SWING. OPERATIONAL CHECK GOOD. (M)