OK, some more...I cleaned up the pwr steer pump and then ran it. It's leaking from the back plate of the pump, not the edge, it seems,but the recessed part of the back plate. What's there? Looking at it, I don't see where there'd be a seal, unless it's leaking at the top of the backplate, and just running down along the edge into the recess. Where can I get a diagram of this?