Yeah, I finally figured out that there was a cylinder under the center of the slide. I'm really glad that I didn't have to do all that. The problem we had was that the jacks were down, but too close to the ground to get under. I couldn't drive the coach to put it on blocks. I couldn't reach the valves to manually release them. Basically I was stuck.
I had a bad solenoid switch to replace. It was almost possible to get it exchanged out, but I left it hanging on the wires. The fix worked, and I could run the slide out to work on it to get the thing remounted.
In my opinion, it is simply a case of bad design. The solenoid failed with no warning (whoever heard of a warning on a solenoid?) so there is no fix and no help except to call for expensive service.
I got lucky, but quite a lot of people would be up the creek without a paddle.
That's my story, and I'm sticking to it.
Retired engineer working full time to keep our coach (08 MADP 4528) operating.