Hi Everyone to follow up on my last post how to change system fluid in the Dualogic... Procedure can be moderate to difficult depending on Model & year of vehicle...heat shield has to be removed if fitted ... Locate pump & reservoir remove pressure pipe 11mm spanner with a suitable container for fluid to drain...Open drivers door to run pump.Check condition of fluid if dirty brown / black Accumulater has to renewed ( highly recommended ) refill with CS SPEED check leaks... Select gears if all gears select OK & system functions on road test.. the most common problem has been rectified... Next post some other faults to diagnose. Hope these discussions have been helpful. .