How do you replace brake lights in brake bar of Cadillac 2006 dts?

To replace the brake lights in the brake bar of a 2006 Cadillac DTS, first, open the trunk and remove the access panel or cover on the side of the brake light assembly. Next, twist the bulb socket counterclockwise to remove it, then take out the old bulb and replace it with a new one. Reinsert the socket back into the assembly, ensuring it locks into place, and finally, replace the access panel. Test the brake lights to confirm they are functioning properly.