How do I change the lights on behind my temerature control panel?

I have a 2000 Chevrolet Blazer. The lights behind some of the buttons on my temperature gauge are out. It is only behind the air flow button which makes the A/C and heater take outside air inside and behind the A/C button and the Rear Defrost button. How do I change this? Do I have to take the whole dashboard apart? Or is it a fuse? Because it is only those 3 buttons that are not lighting up. Any advice would be greatly appreciated!