What was found
(CAN) APPROXIMATELY 90 DME FROM LANDING AT THE TOP OF DESCENT THE CREW NOTICED THE NR 2 HYD CONTENTS DROPPING. AT APPROX 12 DME THE NR 2 HYD CAUTION LIGHT ILLUMINATED. A PAN WAS CALLED AND QRH ACTIONS WERE CARRIED OUT. ENGINEERING INVESTIGATION REVEALED THAT THE NR 2 PRESSURE MANIFOLD INLET UNION HAD FRACTURED. THE UNION WAS REPLACED ALONG WITH THE HYD PUMP AND THE AIRCRAFT WAS RETURNED TO SERVICE. OPERATOR HAS BEEN INFORMED OF SYD 8-29-002, WHICH REPLACES THE ALUMINUM FITTINGS WITH STAINLESS STEEL FITTINGS FOR THIS AREA.