As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) PORTABLE OXYGEN SYSTEM REGULATOR LEAKING PAST TEFLON SEAL.OXYGEN LEAKING FROM HIGH PRESSURE SIDE TO LOW PRESSURE SIDE INCREASED TO OUTLET PRESSURE ABOVE THE REGULATED 50PSI. RELIEFVALVE OPENED AND LOW PRESSURE OUTLET TUBING BURST.