What was found
(CAN) AFTER GEAR UP SELECTION THERE WAS A FAILURE OF THE NR 2 HYDRAULIC SYSTEM (PRESSURE ZERO,QUANTITY NORMAL). GEAR STAYED IN TRANSITION AND THE PTU ALSO FAILED. AFTER GEAR RECYCLED NORMAL PRESSURE INDICATIONS AND OPS AGAIN, BUT THE PTU REMAINED U/S. RELANDING PERFORMED AND AIRCRAFT HANDED OVER TO MAINTENANCE.THE POWER TRANFER UNIT (PTU) WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.