...but I created myself another problem: This is why I wrote before: Do not turn the upper part of the switch, after opening the 6 clips: I turned it over and over to clean it, and out came those little metal bars - and withoutn those the switch does not work. I had to figure out of how to remove the 4 switches: From inside of the switch with 2 little screwdrivers pressing those little latches inside, while allowing space on the other side for the switch to fall out...