What was found
GREEN HYDRAULIC SYSTEM RESERVOIR INDICATED LOW FOLLOWED BY ECAM ALERT, SYSTEM GREEN PRESSURE LOW. CREW FOLLOWED ECAM PROCEDURES FOR LANDING WITH MANUAL GEAR EXTENSION ACCOMPLISHED. *S/D* FAILED LOW LEVEL SWITCH GENERATED ECAM MESSAGE. CREW PROCEDURE IS TO SHUT OFF HYDRAULIC PUMP. THIS ACTION GENERATED A LOW PRESSURE MESSAGE AND THE NEED TO GRAVITY EXTEND GEAR. SWITCH WAS REPLACED AND OPERATIONALLY CHECKED NORMAL.