As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NLG WOULD NOT RETRACT AFTER TAKEOFF FROM IND. THE AIRCRAFT WAS RETURNED TO IND WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NOSE STRUT PRESSURE LOW. THE STRUT WAS SERVICED WITH NITROGEN AND THE NOSE GEAR WAS LUBRICATED. A DIP WAS ISSUED FOR FULL STRUT SERVICE TO BE ACCOMPLISHED WITHIN 20 CYCLES. THE GEAR WAS CYCLED SEVERAL TIMES AND OPERATIONAL CHECKS WERE GOOD IAW MM 32-21-02.