What was found
AIR TURNBACK DUE TO LT NLG DOOR NOT RETRACTING. CREW SELECTED GEAR DOWN, THEN FELT VIBRATION IN NLG AREA. CREW RETURNED TO PHL (SINK RATE GOOD -- NO OVERWEIGHT LANDING). MAINTENANCE FOUND THE ATTACH BOLT FOR NLG DOOR ACTUATING CYLINDER BROKEN AND FOUND A BUSHING MISSING ON THE BOLT SIDE OF ATTACH POINT. FOUND NOSE LANDING GEAR DOOR ACTUATOR ROD BOLT FAILED. INSTALLED NEW BOLT AND HARDWARE IAW MM32-31-16-401. FUNCTIONAL TEST OF DOORS NORMAL AND NO FAULTS NOTED.