As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING WORK ORDER 55311, SEVERAL PSU OXYGEN DOORS DID NOT DEPLOY WHEN SYSTEM WAS ACTIVATED. SEVERAL OXYGEN MASKS WERE FOUND UNSERVICEABLE. REPAIRED OR REPLACED THE AFFECTED PSU'S AND REPLACED ALL UNSERVICEABLE MASKS IAW EO 9-3520-29-E1461 REV A.