I have an 07 uplander with a similar issue. The cables for the motor are in place, but they are stuck. I've since removed the cables from the slider assembly because it needs replaced (a pulley broke off of it, which started this whole mess). I have the part on order and will have it soon - but I am stumped in figuring out how I am going to get the cables extended to connect them. Any idea how to get the motor unseized?