2018 silverado 2500 hd LT heater control back lighting

[Jamazon]

Can anyone help me figure out how to replace/repair the back lighting/console lighting in the heater controls?  I have one light that comes on intermittently for the rear defrost but I don't know if there is a bulb to replace or you have to replace the whole control unit.  The defrost does work and when I push on the defrost the indicator light does work but the back light for the switch usually doesn't.  occasionally it comes on, but most of the time its out.

[drummerman]

Following. This started happening on my 2018 Silverado 1500 about six months ago. You would think that for the money we pay for these trucks that you would get at least four years use before everything starts dying.