ON MINE.. The control board is up front on the passenger side of the coach, ahead of the steps. There is a clear plexiglass pane over it. If you can dredge up a model # of that board, or the model# of the leveler system, PM me your email address and I can send you what I have in .pdf.
What I remember when I had a solenoid quit was that I was somehow able to figure out which one it was, OPEN the valve manually (there is a knob on top), and then retract it with the pump as normal.
Also, there are several fuses on that board. If you have a voltmeter you can remove the clear cover and get to them with the help of a blanket to lay on, and a doubled-up pillow to keep your head and shoulders elevated to reach in. Be careful where you are because that board also controls the jacks, and airbag dump, so stay in a safe position incase the coach dumps air or jacks retract.
There's the other question... Does ANYTHING work, or just the retract slide?
MORE: IF it's like mine, look closely at the stairs, two of them are on a hinge, and you have a couple of screws locking them in place. Remove and lift