GM has many forms of illumination, these days. You may not find a bulb
on that pc board. GM also used tiny 1/8" square LEDs to illuminate many
button controls. These LED's were of the pc board mount type (soldered,
I didn't work for Olds, so I don't know what you have there. I worked
If you see any 1/8", clear plastic piece(s), mounted on the pc board,
then you might have that sort of LED. These things usually have a tiny
bubble lens, to amplify the light.
On the other hand, LEDs rarely go bad. If you found a diode that was
burned, I would start there. You may end up purchasing a new control head.
I wish I could give you some more info., but that's all I have.