Hey Gratefuldad, the pics help. I knew there was something strange about the routing of these lines. Going around the frame is an unusual way to pick up the slack for a hose that is too long, Ha, Ha, Ha. If you find more, please send. Perhaps you have some from the top down?
Pressure lines use fittings all the way whereas the non-pressure line will use a hose with clamp. Take a look at your P/S pump and the line coming from the back at the bottom will be the pressure line, folow the line and notice the fittings. The other line is a combination of hard line and hose connector....this is the non pressure line.
Hope this helps!