What was found
GREEN HYD QTY LOW, TURNED ENG PUMPS (GRN) OFF AT MINIMUM QTY. TEMERGENCY DECLARED. URNED PUMPS ON SHORT FINAL, CONFIGURED FOR LANDING AND TAXI IN NORMAL. PRESSURE ALWAYS NORMAL. VERIFIED NON RETURN VALVE YELLOW MANIFOLD O-RING BAD AND LEAKING. CYCLED CONTROLLES , SERVICED, LEAK CHECKS GOOD PER AMM 29-13-65.