hello there mate, i had kind of the same problem, i have a fiesta rs1880 (1994). Basically my passenger side window stopped working, when i pushed the button nothing happened like no sounds or anything. i tryed a different switch etc but it didnt help. In the end i got my friend to gently pull down on the window while i pushed the button and believe it or not it was just stuck! and now when the wondows seem to stop working which they occasionally do, i just to this method so turns out nothing was actually broken. Not sure if its the same for you but worth a try!