What was found
CREW REPORT: FO AND OBS1 OXYGEN MASKS WORK WELL BUT WILL NOT PRESS TO TEST WITHOUT PUSHING ON INNER O2 DOOR. REPLACED BOX ASSY, OPS CHECKED NORMALLY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
CREW REPORT: FO AND OBS1 OXYGEN MASKS WORK WELL BUT WILL NOT PRESS TO TEST WITHOUT PUSHING ON INNER O2 DOOR. REPLACED BOX ASSY, OPS CHECKED NORMALLY.