As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST ALL OXYGEN SYSTEM PRESSURE IN ALL '3' SYSTEMS AT FL 350. AT A/C BLOCK-IN FOUND ALL O2 BOTTLES READING APPROX 100 PSI. SERVICED ALL O2 BOTTLES PER MM 12-15-01-3. PERFORMED LEAK TEST PER AMM 35-11-01-5. NO LEAKS NOTED. RECHECKED O2 QUANTIY AFTER 30 MN AND O2 QTY HAD NOT DECREASED. A/C OK FOR SERVICE.