I have Power Gear levelers on my Fleetwood. They are electric, though. They have gotten stuck once, and I held down all four buttons (Left, Rght, Front, Back) at the same time to reset the system.
I'm not sure if this works on hydraulic systems or not, but it's worth a shot.
On the bright side, at least yours are stuck in the up position. Mine got stuck while down, with my front wheels in the air. I don't use the Auto Level feature anymore. I only do it manually since I don't like doing wheelies in a 10 ton bus. 🙂