Take the lid off the fuse box, grab hold of the wiring coming out of the front and sharp yank upwards, (or use a small flat blade screw driver to free the clips off starting at the front) this will free the fuse board from the lower casing, then there are three cross head screws two at the front and one at the rear to undo then you can lift the bottom casing up to have a look, but you only have a few inches to play with so needs a bit of juggling about.