As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE SERVICING THE TAIL MOUNTED OXYGEN BOTTLE, AFTER REPLACEMENT OF THE FILLER FITTING, AT ABOUT 300 PSI A LEAK WAS HEARD AND SMALL FLAME SEEN AT THE LINE LEADING TO THE CABIN, FORWARD OF THE BOTTLE. SYSTEM TURNS OFF. THE LINE HAD THREE CRACKS ON THE B-NUT FITTING. LINE REPLACED.