As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: 4L-DOOR ASSIST BOTTLE PRESSURE WARNING ON FLIGHT ATTENDANT CABIN INTERCOMMUNICATION DATA SYSTEM PANEL. REMOVED AND REPLACED DIAPHRAGM IN PERCUSSION MECHANISM OF DOOR DAMPER AND EMERGENCY OPERATION CYLINDER OF 4L DOOR PER AMM 52-10-00-610-001-A.