Check the relay first. There is one for up and one for down. Should be on the passenger side of the motor just behind the starter. You can even switch them and see if you get the same problem in reverse.
You mean by and and they go in?
Don't know never tried. Check your fluid and make sure it's full but unless there is something like water in it you should not need to change it
Uh your safety lever is not engaged is it???????? That would stop it from going down