I've just had mine off and it is a standard (small) microswitch BUT with an Audi connection mounted behind it and soldered on, and resin around the soldered connections. It is then mounted in a plastic frame, which has to hold it firm, and this cannot be removed without breaking it then gluing it in afterwards perhaps, or else by drilling rivets to take the whole lock apart. Mine looks OK though, no sign of water damage, so I have sprayed some WD40 into it (with a straw) and will see how long it lasts.