Thank you everyone and especially <rickjordan> for an eminent description of the bulb replace. I made an attempt yesterday and it was no problem at all. I've just purchased the new buld and will give it a try later today. Just for the record the bulb is a 2 Watt type 12829.
Emil Ísterman, Stockholm - Sweden
MB SL500 -93 - Silver
MB 230CE -84 - Silver
MB 230E -82 - Yellow
MB 180B -59 - Green