I'm not sure if this is a known problem or not but mine has lights that dim out and if you give it a whack they come back to full intensity. At times when they are dim I have no controll over my fan. I am going to replace the controls anyway, no AC in the desert = crap.
I had a bulb go bad on my '05. I just replaced it with a new factory bulb. Very simple. Just remove the a/c control panel and the bulbs are right on the back. Just use a flat head screw driver and give it half a turn and they pop right out.