Climate Control lights went out! how to fix?

ok so i have a 2011 chevy aveo lt. it seems that my climate control lights went out. only half seem to work. i went to the dealer today and it looks like there are three lights that illuminate that instrument panel. i beleive that two of them are out because only half of it seems to work. does anyone know how i can replace the bulbs? the dealer wants me to buy a whole new climate control unit.

This all happened after i installed a new head unit and subs. not sure if this has something to do with it. but can anyone give me some incite on how to fix this? thanks in advance.