I was told by Jim Farley himself that they will not build another GT500. He said this is old technology and they are leaving it up to Shelby American. He also stated that Shelby does a good job with it.
There is nothing in the manual. I found out just by noticing that when I pushed the memory button on the door the colors would revert back. Set the color you want and then push and hold the memory button on the door that matches your fob and hold it until the memory save message comes on.