What was found
ON APPROACH INTO PHL UPON NORMAL EXTENSION, THE NOSE GEAR RED LIGHT REMAINED ILLUMINATED. CREW PERFORMED AN ALTERNATE EXTENSION AND RECEIVED THREE GREEN LIGHTS. AIRCRAFT LANDED WITHOUT INCIDENT. PHL MAINTENANCE INSPECTED AIRCRAFT. FERRIED GEAR DOWN TO MDT WHERE MTC TROUBLESHOT SYSTEM AND FOUND THE RIGHT PRESSURE MANIFOLD CHECK VALVE AT FAULT. THE PRESSURE MANIFOLD WAS REMOVED AND REPLACED, SYSTEM SERVICED, BLED, AND OPERATIONALLY CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (X)