As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER O2 MASK DOOR AT 11ABC WILL NOT FULLY RELEASE DURING O2 DROP TEST. REPLACED PSU AT ROW 11ABC P/N 417N3011-601D, S/N 07L19 IAW AMM 25-23-61. PERFORMED OPS CHECK AS PER AMM 35-22-00 WITH NO FURTHER DEFECTS NOTED. REMOVED SAFETY PIN.