As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NOSE GEAR WOULD NOT RETRACT AFTER TAKEOFF FROM LAS. RECYCLING THE GEAR DID NOT HELP. THE AIRCRAFT WAS RETURNED TO LAS WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NLG SHOCK STRUT INFLATION LOW. THE SHOCK STRUT WAS SERVICED IAW MM 32-31-02. NO LEAKS WERE NOTED. THE NLG WAS SWUNG AND ALL OPERATION AND INDICATIONS WERE GOOD.