As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
O2 SYSTEM LOSING 100 PSI PER HOUR. SUPPLEMENTAL, FOUND LEAK AT FITTING CREW 02 BOTTLE REF MM 12-15-21, ALSO HOSE RECEPTACLE AT 1ST OBS SEAT TO BE FAULTY AND LEAKING. REPLACED 02 BOTTLE ALSO RECEPTACLE AT 1ST OBS. LEAK CHECKED GOOD WITH NO PRESSURE DROP IN 3 HOURS. AC OK FOR SERVICE.