As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE NLG DID NOT RETRACT WHEN SELECTED. AIRCRAFT RETURNED TO CLT LANDING WITHOUT INCIDENT. USING THE AIRCRAFT MANUALS MAINTENANCE REMOVED AND REPLACED NLG SELECTOR VALVE. TESTS WERE ACCOMPLISHED USING THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.