As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRST OFFICER`S SIDE OXYGEN MASK WAS LEAKING WHEN IN EMERGENCY MODE IT IS A FASTER LEAK. REMOVED AND REPLACED FIRST OFFICER`S OXYGEN MASK IAW AMM 35-11-12. ALL CHECKED GOOD IAW AMM 35-10-00, AND AMM 23-51-00. NO LEAKS NOTED. ACFT OK FOR SERVICE.