What was found
IN CRUISE, HYDRAULIC QUANTITY DROPPED SLIGHTLY ABOVE EMERGENCY LEVEL. PERFORMED LOSS OF HYDRAULIC PRESSURE ABNORMAL EMERGENCY CHECKLIST. FLIGHT RESTRICTED TO MACH .65 AND 230 KIAS. CONTINUED WITHOUT INCIDENT. AFTER LANDING, MX FOUND AUX RUDDER PUMP LEAKING. REMOVED, REPLACED AND LEAKED CHECK PUMP, SERVICED FLUID, AND RETURNED AIRCRAFT TO SERVICE.