Hi there this is my first post, so here goes. In my office one of the p2015s has been leaving vertical black lines down the left hand side of the page. I have already tried the following. 1) Running the cleaning utility. 2) cleaning the paper path with canned air and an alcohol swab 3) changing the toner cart 4) replacing the transfer roller... all with no success

. Attached is a pdf scan of some of the pages with the last one being one of the cleaning pages ignore the lines going down the center as these are not on the physical page itself. The only thing left that I can think of would be the fuser itself. Any ideas?