As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 330 CREW NOTICED OXYGEN QTY DEPLETED. FOUND LOWER O2 TRANSDUCER BROKEN. SWAPPED 2 PAX O2 BOTTLES TO CREW POSITION, REF MM 12-15-08. LEAK CHECK PERFORMED NO LEAKS, ALSO SWAPPED LWR TRANSDUCER TO PAX FWD POSITION REF MM 35-11-03. PLACED PAX O2 SYSTEM ON DMI 368 PER MEL 35-1-3.