As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MESSAGE ON CIDS PANEL TO CHECK DOOR 4L PRESSURE. SERVICED DOOR 4L ASSIST BOTTLE. DUE TO REPEATED SERVICINGS, COMPLETED ADDITIONAL TROUBLESHOOTING AND FOUND PERCUSSION DIAPHRAGM LEAKING. REMOVED AND REPLACED DIAPHRAGM-SEALING IAW 52-11-05.