How do you replace the lights that illuminate the temperature settings on a 1999 Buick Regal LSE?

I have a 99 Buick LS. I had the same problem and had to replace the Climate Control Panel. Brand new, they're about $425 but there is a guy on Ebay who will sell you a refurbished one for $80 plus refundable $100 for your old one. They are easy to put in.