What was found
AIR TURNBACK, YELLOW HYD LOSS. AFTER TAKEOFF, LOST YELLOW HYDRAULIC SYSTEM. ECAM PROCEDURES ACCOMPLISHED. REMOVED AND REPLACED LEAKING GROUND SERVICE MANIFOLD, LK AND OPS CK GOOD. RECOMMENDATION: REMAIN OPEN PENDING REVIEW OF TEARDOWN REPORT, A/C HAS HISTORY OF YELLOW SYS LOW, NO TOTAL LOSS OF FLUID.