How do you disassemble the bumper on an FX4 with backup sensors? Mine has two nasty scratches on it that were starting to rust, I sanded them down to bare metal and primered it for now. The Ford place is offering to repaint it for $256, the LineX place is offering about the same price, but I have to take it off and reassemble it myself. So what's it take to get this thing off, without breaking anything? Does the hitch have to be removed as well?