What was found
PHL - FLT 77 ,EN ROUTE CUN - PHL, UPON LANDING GEAR EXTENSION IN PHL, RECEIVED ALL THREE GEAR DOWN UNSAFE LIGHT INDICATIONS. THE CREW RECYCLED THE LANDING GEAR AND SUBSEQUENTLY RECEIVED THREE GREEN, DOWN AND LOCKED INDICATIONS. FLIGHT CONTINUED TO LANDING WITHOUT FURTHER INCIDENT. AFTER LANDING, RECEIVED ECAM MESSAGE, "L/G DISAGREE". MAINTENANCE FOUND A FAULTY RIGHT HAND, GEAR DOOR PROXIMITY SENSOR. REPLACED THE SENSOR AND PERFORMED BITE CHECK OF LGCIU SYSTEM. ALL CHECKS OK.