I've had that problem with our motorhome when the electric motor failed that operates the hydraulic pump. You have to open the zones one at a time with an allen wrench. You should have instructions in your operations manual.
I'm going out to Yuma January 2012.
Any advice on places to stay at or see? I'm planning on five days.
I'm going to Memphis,then through Ark , TX to El Paso and then to Yuma.
Thanks in advance for your advice