What was found
WHEN THE LANDING GEAR WERE LOWERED THE GREEN HYDRAULIC SYSTEM FAILED. ALL LANDING GEAR SHOWED DOWN WITH 3 GREEN LIGHTS EACH ON THE FRONT PANEL AND THE OVERHEAD PANEL. THE LEFT MAIN GEAR DOOR LIGHT WAS ON WITH AN ECAM MESSAGE SAYING THAT IT WAS NOT UP. AFTER LANDING, WE WERE TOLD THE LEFT MAIN GEAR DOOR ACTUATOR FAILED RESULTING IN HYDRAULIC FLUID LOSS. REMOVED AND REPLACED LEFT MAIN GEAR DOOR ACTUATOR IN REF TO MM 32-31-35-4. OPS CHECK DOOR OPERATION REF 32-31-00. PERFORMED LEAK CHECK OF ACTUATOR, NOLEAKS NOTED. REPLENISHED GREEN SYSTEM HYDRAULIC RESERVOIRS REF MM 12-12-29-0, OFF MFG 21030-000-00 SRL CV0011.