Took out my HVAC controls and my radio today after searching for what type and how many bulbs I needed to fix my spottily lit dash turned up muddled results. Found out soon enough when I took it all apart - I'm surprised that there aren't more articles out there on how to repair the radio bulbs, it seems most people send their radios off for rebuilding or just get an aftermarket head unit. They're not hard at all to get taken apart, you just have to be careful. GM did a good job of making them look impenetrable, but they're definitely not.
Radio:
View attachment 19804
HVAC:
View attachment 19805
The count for the bulbs, for those who want to know and might want their lights to work again, is:
3mm bulbs: 9 (2 HVAC and 7 Radio)
4mm bulbs: 3 (Radio)
4.7mm bulbs: 6 (HVAC)
I'm not too interested in going LED on this part of my vehicle, I like the stock look really well actually. I ordered the correct bulbs (14V, not 12 like can be found in the 3mm at RadioShack) from an automotive cluster parts supplier on ebay.
It all gets put back together tomorrow so I can have a radio and some heater controls til the bulbs arrive, but next weekend the soldering shall commence!