I have a 1994 Lexus ES300 and recently the middle of the AC unit lcd got dim. The AC works fine and you can still see everything, just that it is dim in the middle. So when it is dark, you can clearly see that it is dim. Is there a bulb or something I can change to fix this since it looks really bad. I do not want to buy a new AC unit just because it is dim, so if anyone has any information on how to fix this, please let me know.