One of the three illumination bulbs burned out behind the D.I.C. (driver information center) one dealer told me it's a sealed unit and that I would have to buy a new one for some outragous price of $900 and some dollars. I went to another dealer, they told me they can get me the circuit board with the bulbs, but not just the bulbs for $300 and some odd dollars???? I went to dealer number three, and two service guys could not find the right bulb, they called two other dealerships on the phone and still, no one knew how to get the bulb, or even if It was replaceble???...Their advice to me was "just live with half of the D.I.C. no working"... Finally I gave up and went to a little no-name auto part store where some older ladie was working the counter, I showed her the bulb..told her my story, and she asked how many I wanted. They were 25 cents a piece she had over a hundred in stock and knew the part number off the top of her head???? I told her to go get a job at GM! Thanks GM for training your part dept. guys so well! Here is the info incase someone has had this problem: Wagner bulb part#PC74
14V miniaturelamp. My trunk light just went out, I guess GM will tell me I have to buy a new trunk??? LOL