What was found
JFK - FLT NR 227 - AFTER TAKEOFF, THE NOSE LANDING GEAR UNSAFE LIGHT CAME ON. RETURNED TO JFK. NOSE STRUT FLAT. CHANGED SHRADER VALVE, TWA 32-5315 MFG MS28778-7. SERVICED NOSE STRUT WITH HYDRAULIC FLUID AND DRY NITROGEN. LEAK CHECK OK.