As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NLG RED UNSAFE LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION. MAINTENANCE FOUND THE NLG STRUT SCHRADER VALVE LEAKING. THE O-RING WAS REPLACED. THE NLG STRUT WAS SERVICED WITH NITROGEN AND A DIP WAS ISSUED FOR FULL SERVICE AT NEXT RON MAINTENANCE.