BMW Repair: 1991 750il Power Steering, auto parts store, v12 engine

Question
Hello, I just bought a 91 750il from a friend.  The power steering system is starting to make a "roaring" noise when turning the steering wheel at low speeds.   I went out to the auto parts store and purchased some Power steering.  My problem......  - this V12 engine is so huge and complex, that I cannot locate the power steering fluid reservoir.  Do you have any idea of where it is on this engine??  Pls help if you can.

Answer
I would first look in the owners manual.Not having that I would look on the left side(drivers side)of the engine.Caution needs to be taken when adding fliud.You must pump the brakes until they are rock hard(to eliminate the hydraulic boost pressure)When adding fluid(which is green,a special oil)fill to the required amount about 10 mm from the top