I am printing from any drawer via 11x8.5. When printing, there is a smudge mark on the lower end of the 8.5 side print. It is always in the same spot, but there are a few more smaller spots that show up from time to time. The other end of the print is washed out. I have replaced the paper, fuser, toner cartridge, transport roller, formatter board, and DC Controller. The problem has not changed at all. I am stumped @ what is causing this.