As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA - FL 475 - AFTER TAKEOFF, THE NOSE GEAR WOULD NOT RAISE AND THERE WAS AN UNSAFE NOSE GEAR INDICATION. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE SERVICED THE NOSE LANDING GEAR STRUT AND REPLACED THE SCHRADER VALVE. (X)