As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L4 DOOR OPERATION CYLINDER DEPLOYED IAW AMM 52-22-00. CYLINDER WOULD NOT TAKE A CHARGE. REPLACED DIAPHRAGM IN PERCUSSION MECHANISM ON L4 DOOR AND SERVICED DOOR DAMPER AND EMERGENCY OPERATION CYLINDER IAW AMM 52-10-00. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK. AIRCRAFT WAS GROUNDED.