Chosen Solution

The heater, defroster control knobs and radio lights are burning out one by one. How do I replace them as they are soldered in place

Here’s a video on how to do it: https://www.youtube.com/watch?v=_DVz8Am9… I’d replace even the ones that have not burned out as of yet while you’re in there. Looks like succeeding with the x-mas tree has inspired you to fix other things. You may want to pick up one of these kits: https://www.ifixit.com/Store/Tools/Toolk