As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MOC REQUESTED TROUBLESHOOTING DUE TO (2) TWO PREVIOUS SERVICING EVENTS AT 4L DOOR ON 1/14/13 & 2/13/13 FOR CIDS PANEL INDICATION '4L CHECK BOTTLE PRESSURE'. TROUBLESHOOTING WAS DEFERRED UNTIL 2/24/13. MAINTENANCE FOUND NO VISIBLE LEAKS - REMOVED AND REPLACED DOOR 4L EMERGENCY OPERATION CYLINDER IAW AIRBUS MAINTENANCE MANUAL 52-13-14-04.