Zanussui Dishwasher DW 24 Serial number 92690177?

My dishwasher , just out of Guarantee stopped working . There was a bang and the smell of an electrical fault. but my wife who was next to the machine took out the plug,the plug fuse was not blown. I am suspicious about the on/off swith ( with a light) as the bang was in this area of the machine. Also when under guarantee, 2 of these light type on/off swithes were replaced. To check this I need to get inside the door but I don't know how to remove the screws from the door to get at (expose) the switch. Can anyone helpand tell me how?