What was found
THE B SYSTEM HYDRAULIC QUANTITY DECREASED TO 1.8 GALLONS IN FLIGHT AND WAS ACCOMPANIED BY ILLUMINATION OF THE B SYSTEM LOW QUANTITY LIGHT. THE ABNORMAL CHECKLIST WAS ACCOMPLISHED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 5 LEADING EDGE SLAT ACTUATOR LINE LEAKING. THE LINE WAS REMOVED AND REPLACED. LEAK AND OPERATIONAL CHECKS WERE GOOD.