What was found
HYD VOLUME LOW AMBER CAS: AT FL410 ASKING NO DEMAND ON HYRAULIC SYSTEM WE GOT A HY VOLUME LOW AMBER CAS . DECLARED AN EMERGENCY AND DIVERTED TO IAD AIRPORT. USING THE CHECKLIST WE USED THE EMERGENCY GEAR EXTENSION FUNCTION AND BROUGHT THE AIRCRAFT TO A STOP ON THE RUNWAY USING THE EMERGENCY BRAKE SYSTEM. //SIGNOFF//FOUND HYDRAULIC FLUID DRAINING FROM THE HYD PUMP PAD SEAL DRAIN LINE. REPLACED LH ENGINE DRIVEN HYDRAULIC PUMP IAW CE-680A AMM 29-10-05, OPS CHECK AND LEAK CHECK GOOD