A fluid leak may develop from one or more power steering hose. When a leak is being repaired, it is not uncommon for multiple hoses to be replaced.Google+
Car Problem Reports
BMW 540i Multiple Power Steering Hoses May Simultaneously Fail
BMW 540i Problem
This is a PIA for the hoses to the rack. You have little room and need to loosen engine mount and Jack it up to get hands in there. Prepare for skin loss and scratches. hard to get to bolt on cover with shroud in place.
Lost a lot of fluid when car would sit. Leaks found around compression connection of metal and rubber joints. You could spin the metal tubing around like a swivel and it was leaking overnight.