As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE BASE VISIT FOUND THE FORWARD CABIN PERSONAL BREATHING EQUIPMENT HAD LOST ITS VACUUM SEAL. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE FORWARD CABIN PERSONAL BREATHING EQUIPMENT AS REQUIRED AND IN REFERENCE EO CR-2500-080R1. THE AIRCRAFT WAS RETURNED TO SERVICE.