As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN THE LANDING GEAR WAS SELECTED `UP` THE NOSE LANDING GEAR DOORS FAILED TO CLOSE. THE GEAR WAS RECYCLED AND THE NLG DOORS INDICATED `CLOSED`. THOROUGH TESTING AND INVESTIGATION IAW MAINTENANCE MANUAL FAILED TO FIND A CAUSE FOR THE DEFECT AND THE AIRCRAFT WAS RETURNED TO SERVICE WITH NO FURTHER INCIDENTS.