Internal reports on a 4260 copier/printer are a gray color, not black. A new drum only slightly improved the print. Can someone describe how to troubleshoot this further. I have cleaned the contacts to the transfer roller but that didn't help. I also tried to clean the laser scanner window but I did not remove the assembly so I am not positive I got the right part clean. (looks like the service manual says to remove the LCU). The toner was low but not out and the print was not blotchy so I think toner supply was okay. Any help would be appreciated. Thanks.