If I manually pull them out (up) and then turn on the wiper swithc, they will retraqt, but they will not go up or run. Fuse is fine. I did turn then on (and then off) when they were frozen down a few weeks ago, and have not driven the vehicle since then. Any thoughts? Is it simple, or do I need to replace the wiper motor, and how hard is that? Thanks very much!