As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS O2 MASK WOULD NOT OPERATE PROPERLY WHEN FUNCTIONAL CHECKED. COMPLIED WITH REPLACMENT OF PILOT 02 MASK. AFTER REPLACEMENT OPERATIONS CHECKED FUNCTION OF 02 MASK, O2 MASK FUNCTIONED PROPERLY. AIRCRAFT OK FOR RETURN TO SERVICE.