I also had a solonoid go bad. It was replaced, and all was well.
I believe that there is a slide lock on your Vectra. I assume that you've unlocked it, although I don't know if it would have any effect on the jacks. My 2006 Journey has the straps for slideout protection instead of the key locks.
HWH and Winnebago Owner Relations as stated above are definitely the place to go before you take it to a shop.
W8RLM - Bob
2006 Winnebago Journey, Model 39K, 2013 Dodge Dart