Power Steering Leak-95 Formula

I have a 95 Formula 5.7 Liter. The power steering reservoir was empty when I checked it yesterday (pump was groaning on turns). I filled it up and the level is still OK after 30 miles, but there must be a slow leak. I haven't been under to see where it's leaking yet. I just wondered if there is a usual spot in the system where that happens. Perhaps a worn seal? If you have experience with this problem, please advise. Thanks!

After many years sometimes the nuts work themselves loose..check to see that the two nuts holding the lines into the resorvoir are tight...if you want take them off and place plumber's tape on the threads, if you have them, for a nice tight seal.