Hi Geoff,

If you are talking about switches such as sunroof, etc. then the solution is fairly easy. You do not need to buy the entire switch. Just pry the switch out (If I remember correctly I actually dropped the kick panel on the driver side to gain access to those switches from behind and push them out) On the side of each switch you will see a small plastic circle with an indentation for a screwdriver, this is actually the butt end of the bulb, screw the bulb out (takes 1/4 turn). I happened to have similar switches from an old Mazda RX6 laying around in my garage and turned out that the bulbs were still good in those, moreover they were interchangable with ones on my 850. This makes me think that you should be able to buy these bulbs at any parts store.

Sergei