What was found
THE A/C, LOST BOTH HYD PRESS (BOTH PRESS 0) WHILE TOUCH DOWN AND USE REVERSE THRUST(BOTH SIDE HYD QTY NORMAL.L:15, R:17 PROCEED QRH(L/R)HYD PRESS LOW PROCEDURE:TRANS PUMP SW OFF CHECK PRESSURE AND QTY NORMAL.TAXI BACK TO GATE. ENGINEERS VISUAL CHECKED, FOUND PUMP, HYD TRANSFER (PTU) LEAKAGE. REMOVED DEFECT PART SENT TO SHOP, FOUND HOUSING, DRAIN PORT ASSEMBLY CRACK.