As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK. DEPARTING PIT NLG WOULD NOT RETRACT. FERRIED TO MDW FOR MAINTENANCE. FOUND FAULTY NLG DOWNLOCK ACTUATOR AND NO POWER FROM PSEU. REMOVED AND REPLACED DOWNLOCK ACTUATOR PER MM. REMOVED AND REPLACED PSEU PER MM. REMOVED AND REPLACED GEAR TRANSFER VALVE PER MM.