I've got a 90 735iL and they are notorious for P/S leaks which are usually due to the crappy factory clamps. I would go ahead and change the clamp on the hose from the reservoir to the pump whether it's leaking or not, just to save a headache in the future.
Other than that, I can't think of anything else to warn you about.
Mine has been mostly problem free. Other than scheduled maintainence, it hasn't seen any real garage time.
Good Luck!