One of the things I first noticed about the machine was that none of the feature lights would come on. That generally indicates a problem with the light driver board. Fortunately, when I opened the backbox, I noticed this burnt connector. When I jiggled it a little, the lights came on. Some of them were pretty dim, though.
So, I’m going to try replacing the connector pins and the plug. If that works, great. Otherwise, a board repair will cost about $60.