As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INVESTIGATION OF A SLOW LEAK IN THE OXYGEN SYS, A CRACK, ABOUT 0.250" WAS FOUND ON THE ELBOW FITTING THAT CONNECT O2 SUPPLY LINE FROM THE BOTTLE, THAT PASS THRU THE FUSELAGE FOR THE AIRFRAME OXYGEN SYS. THE SLOW LEAK COULD HAVE INCREASED WITH VIBRATION AND CAUSE A MUCH HIGHER LEAK IN THE O2 SUPPLY SYS. THE ACFT WAS GROUNDED AND THE PART WAS ORDERED AOG.