I get not doing a whole repaint cause it cost money. But not repainting s few spots that look very bad is a sign of neglected maintenance. Not saying Kentucky Kingdom doesnt negkect maintenance. But it can be a sig. You know its bad when coasters at smaller parks that have kept the same color om older rides has a better paint job then this one. Look at Tennessee tornado, afterburn and so many others
If I have to guess, probably the wheels. It seems apparent that the dirtiest sections of track are during parts of the ride with high positive g-forces.