Other good posts:

http://www.classiczcars.com/forums/electrical-s30/38932-interior-instrument-light-rheostat.html

Hi George,

Thanks for the post. That was a good explanation. This sort of electrical failure is like my version of CSI. Looks like the coil that is broken off is compressed a bit and discolored at the broken off end. I wonder if a brief short across the light bulbs it was feeding might do that.

Hi Blue,

I can see the rheostat. That one is open in the back.

Mike