bmw e34 525 touring power steering not working!

[johnsim525]

HI everyone. i'm new on here so this is my first post. I just bought a bmw E34 525i 24v touring and the power steering dosent work. there seems to be a leak from under the rear of the car. The guy I bought the car from said there is a leak from one of the metal hoses at the rear due to a pin prick size hole. Has anyone replaced power steering hoses or had similar problems? Also has anyone got any detailed diagrams of the pipes and system so i can work out whats leaking.
Thanks John