Okay. Well, then, why doesn't it push foam out the PS return? This is why I posted the question about further testing and possibilities. IIRC (You'd think I'd know,. I was just out there this afternoon!), there's just one pressure line from the pump, which goes to the HB, then the steering gear. So, I think my next step is to lift the car, again, and try the steering, lock to lock a few times. We only tested it , running, today, with wheels on the ground and turning back and forth enough to hear the groaning. I'm inclined to think that I wasn't thorough enough.
BTW, I already have a rebuilt pump, pump-to-HB hose, filter and fluid, so, I'm set to tackle that end, if I do prove that the pump is bad.
Thanks for all your good input.