As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, NOTICED ALL FOUR OXYGEN BOTTLES WERE EMPTY, FOUND COURIER O2 MASK NOT PROPERLY STOWED AND LEAKING. REPLACED THE OXYGEN MASK IAW MM 35-13-03-2. OP AND LEAK CHECKED NORMAL IAW AMM 35-11-01-4-0. R & R ALL 4 CREW OXYGEN BOTTLES LEAK & OPS CHECKED GOOD IAW MM 35-11-01-4-0. ACFT OK FOR SERVICE