Are you currently in Lapeer with your rig or somewhere else? Assuming you have electric front jacks and not the leaky Lippert hydraulics, there isn't a whole lot to them. A drive motor with a plastic gear box, a breaker fuse, worm gears at the top of the jack posts, and the crossbar that runs from the door side (where the motor is) to the opposite side to drive it. As mentioned, find that breaker first and try pushing the little reset button. On some models, there is supposedly an inline fuse hidden somewhere in the wiring (in the front compartment). Look for a fuse holder. While you're at it, check all the wire nuts in the system. They've been known to not be installed correctly and come loose.
I replaced my electric jacks with the Reico-Titan Ground Control system early last year. Unfortunately, I got tired of the parts laying around and took them and my old pin box to the scrap yard a while ago.
I agree, you're getting hosed by the repair company saying that everything needs to be replaced. But, the warranty period is what it is.
