What was found
LOG PAGE # 502922. DISCREPANCY: ON CLIMB OUT OF MIA AT 8.0, OBSERVED QUANTITY DROPPED TO STAND PIPE WITH RESERVE LOW AND AILERON AND RUDDER REVERSION LITES ON; EMERGENCY CHECK LIST ACCOMPLISHED, FUEL DUMPED TO MAX LANDING WEIGHT PER ABN CHECK LIST. CORRECTIVE ACTION: FOUND HORIZONTAL STABILIZER AND RUDDER HYDRAULIC PRESSURE ACCUMULATOR LEAKING. REMOVED AND REPLACED HYDRAULIC PRESSURE ACCUMULATOR IAW MM 27-41-11. OPS NORMAL, NO LEAKAGE NOTED. ALSO BLEEDED BOTH ENGINE DRIVEN HYDRAULIC PUMPS IAW MM 29-10-12. OPS CHECK NORMAL IAW MM 12-30-1.