As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORT: CREW OXYGEN IS BELOW MINIMUMS. SERVICED O2. INITIAL READING WAS 790 PSI AND SERVICED TO FULL 1850 PSI. OXYGEN LEAK RECURRED. LOST 200 PSI IN 2HR 20MIN OF FLT TIME. SERVICED O2 SYSTEM TO 1890 PSI. APPLIED LEAK CHECK TO O2 BOTTLE CONNECTIONS. NO DEFECTS FOUND. SUSPECT PRESS REG & TRANSMITTER HAS INTERNAL LEAK. ACCOMPLISHED LEAK CK AND REPLACED PRESS REG & TRANSMITTER. OPS ARE NORMAL.