As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4512 THE CREW REPORTED THAT THE OXYGEN CYLINDER ASSEMBLY SYSTEM WAS LEAKING. THE CREW ELECTED TO RETURN TO XNA AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE CAPILLARY LINE O-RING IAW EMB 135-AMM 35-10-17. THE LEAK CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.