Jacks will not go up or down

We have a 2011 Tiffin Allegro Red and had the same problem. Be very careful because our motor home rolled so slowly we didn't know it was moving until my car stopped it. Over $5000 damage between the MH and the car. We took our MH to Freightliner in Gaffney, Sc because over the phone they said it was a chasis problem. After we got there, they said it wasn't a chassis problem. They did check some items and bled the brakelines but said they couldn't find the problem. Somehow I think they fixed the problem without trying. When we pull the yellow knob since that visit, it has worked properly every time so our slides and jacks will work. We are now in Red Bay, AL with over a 100 other units waiting on service. Good luck in your repairs.