As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT ATTENDANT CIDS PANEL MESSAGE DISPLAYED, L1 CHECK DOOR PRESSURE. THE AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND THE L1 DOOR ASSIST BOTTLE PRESSURE LOW, REPLACED THE DIAPHRAM AND SERVICED THE BOTTLE TO PROPER PRESSURE IAW AMM 52-10-00-610-001-A. MAINTENANCE ALSO PERFORMED A SATISFACTORY OPERATIONAL CHECK.