Picking up from what Colin said, how did your garage know it was the element. Did they drop the dash or maybe remove the screen because if all they did was check it from the switch or other wiring then I don't see how they would distinguish between an element fault and a wiring fault.
Where the wires attach to the screen is very awkward to get to and is horribly bent and squashed under the screen when it is in position.
When I had my screen out a few weeks back I remember thinking that the connection was a potential failure point.
