Heater control lights don't work.
#1
#3
Unless you plan on soldering the new bulbs in, you should consider just buying a new control panel. I did my 2002 a while back. The lights are made onto the circuit board. Apparently GM wants you to replace the panel when the lights go. As I said, I did replace my bulbs but I do electronics for a living. Not sure I'd recommend de-soldering old bulbs and soldering in new bulbs to the average Joe.
#4