How to replace lic plate bulbs on my 2003 buick lesabre Ltd.

You will need to remove the push-in plastic pieces that hold the trunk liner - maybe 4 places. A tool to do this is available at a parts store, but it isn't cheap. It can be done with a screw driver and pliers, but then they cannot be reused unless you were very careful. Once you can get in between the liner and the metal of the trunk lid, you use a small socket (cannot remember which size right now, but maybe 3/8-inch) to remove about 6 nuts from the bolts that are attached to the license plate assembly. That whole assembly then can come out, but be careful that you don't pull too hard or the wiring can be damaged. The bulbs can be replaced easily once the assembly is out of the vehicle. If you think it is a pain to get it out to replace a bulb, then you should replace ALL the bulbs at the same time - unless some of them of been replaced within the past year or two.