As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THE OXYGEN SYSTEM WAS LOOSING PRESSURE. MX LEAK CHECKED THE SYS AND FOUND THE CAPILLARY OXYGEN LINE IN THE NOSE SECTION OF ACFT WAS LEAKING. THE DEFECTIVE LINE WAS REMOVED AND A NEW LINE PN 9912057-11 WAS INSTALLED. THE OXYGEN WAS SERVICED TO FULL WITH ABO AND THE ACFT WAS RETURNED TO SERVICE.