What was found
PITCH ENHACEMENT SYS, HYD POWER TRANSFER UNIT FAILURE/RUPTURE. WHILE TESTING SPOILERS, AILERONS AND FLAPS A LARGE HYD LEAK WAS NOTICED FROM THE HORIZ STAB COMPARTMENT. CONDITIONS IMEDIATLY PRIOR TO SHUTDOWN OF HYD; LT HYD PUMP ON(QYT 1.4), THEN RT HYD PUMP ON (QTY0.94), ALL WING AND TAIL SHUTOFF VALVES (6 OF) SELECTED TO OFF. CONDITIONS IMEDIATLY AFTER SHUTDOWN OF HYD; LT HYD PUMP OFF (QYT1.4), THEN RT HYD PUMP OFF (QTY0.70), BIG PUDDLE ON THE FLOOR, HORIZ STAB COMPARTMENT WET, NOT MISTY. PTU TEST HAD BEEN ACCOMPLISHED DURING PRE-DEACT PHASE OF CHECK, AND PASSED. CHANGED PTU.