How do I replace the lightbulb for the radio buttons on a 1998 Avalon XLS?

I have included a diagram showing an exploded wiew of the dash and the removal and re-install instructions for the upper and lower heater controls which inlcudes radio.
You will see the bulf sockets in the back of the controls and/or button in question. There are no intstructions for this, so you just have to inspect them for kooing burnt out or replace all of them.