As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A FLIGHT WAS CANCELLED WHEN THE FLIGHT CREW DISCOVERED AN OXYGEN LEAK. THE MAINTENANCE TEAM DETERMINED THAT A OXYGEN LINE TEE FITTING LEAKING. THE DEFECTIVE TEE FITTING WAS REMOVED AND A NEW FITTING WAS INSTALLED PN AS4857-01. THE OXYGEN SYSTEM WAS SERVICE AND LEAK CHECKS WERE SATISFACTORY. AIRCRAFT WAS RETURNED TO SERVICE.