What was found
F/O OXYGEN MASK WILL NOT TEST. INSTALLED SERVICEABLE CREW QUICK DOWNING OXYGEN MASK AND STOWAGE BOX ASSY IAW MM 35-12-51-4.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
F/O OXYGEN MASK WILL NOT TEST. INSTALLED SERVICEABLE CREW QUICK DOWNING OXYGEN MASK AND STOWAGE BOX ASSY IAW MM 35-12-51-4.