As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3734 THE CREW REPORTED THE AFT CABIN PERSONAL BREATHING EQUIPMENT COVER FELL OFF. THE AIRCRAFT WAS REMOVED FROM SERVICE. RE-SECURED LOOSE PERSONAL BREATHING EQUIPMENT COVER AS REQUIRED IAW STANDARD MTX PRACTICES. THE AIRCRAFT WAS RETURNED TO SERVICE.