What was found
FLT 6230 - PHL-IAD - DURING DESCENT, MADE AN SCHEDULED LANDING AT IAD WITH ONE DISCREPANCY WHICH WAS BOTH LT AND RT HYD PRESSURE ON MAIN PUMPS DROPPED TO ZERO IN FLIGHT. CREW HAD TO MANUALLY PUMP GEAR DOWN TO GET GREEN LIGHTS. A/C WENT TO GATE WITH NO FURTHER PROBLEMS. MX INSPECTED AND FOUND CRACK IN HYD LINE FITTINGS CONNECTED TO LT HYD PUMP. MX REMOVED AND REPLACED HYD LINE, OPS CHECK OK. NO PRIOR PROBLEMS BEFORE THIS INCIDENT. A/C WAS RELEASED AND RETURNED TO SERVICE. (M)