What was found
BOS - FLT 1170 - EN ROUTE SJU-BOS - LOST GREEN HYDRAULIC SYSTEM, ECAM MESSAGE LOW QUANTITY INDICATED. PERFORMED CHECKLIST PROCEDURES AND MANUALLY LOWERED THE GEAR. LANDED BOS WITHOUT INCIDENT. REPLACED O-RING AT NR 2 ENGINE GREEN PUMP SUPPLY LINE, CHECKED CASE DRAIN FILTER, SERVICED GREEN SYSTEM HYDRAULIC RESERVOIR. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)