There is a plastic trim piece just behind the front wheel, down low. I don't know what it is called. There is a hole at the very bottom of this piece, where I found lots of rust flakes. In fact, I used a rubber hammer on this piece and got about a pound of rust out of each hole. Some day I need to remove this piece and see what is rotting away. Has anyone else done this, and do they know what parts are rusting out? Maybe someone has a picture of this area with the part removed.