As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2370 - EWR - LIGHT CREW PERFORMED AIR RETURN DUE TO LANDING GEAR NOT RETRACTING. CREW LANDED ACFT UNEVENTFULLY. EWR MX REMOVED AND REPLACED LANDING GEAR CONTROL LEVER AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.