As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE LANDING GEAR FAILED TO RETRACT AFTER TAKEOFF. RETURNED TO BOS AND LANDED WITHOUT INCIDENT. FOUND NOSE LANDING GEAR STRUT COMPLETELY FLAT. REPLACED NOSE LANDING GEAR PACKINGS AND SCHRADER VALVE. SERVICED NOSE STRUT. SYSTEM GROUND CHECKED NORMAL OPERATION.