As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TUL INFLIGHT - NOSE LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. RETURNED TO TUL AND LANDED WITHOUT INCIDENT. AIRCRAFT TAKEN OUT OF SERVICE FOR EVALUATION. SERVICED NOSE LANDING GEAR STRUT PER MAINTENANCE MANUAL 32 21 02 3. SYSTEM GROUND CHECKED NORMAL OPERATION.