Just purchased a Tosh E- studio 4500c, excellent condition except for racer stripes towards the right side of print. I did a cmyk test of solid single color prints and racer stip only appears on single yellow color. I dissassembled and inspected drum drum charger unit and cleaned and saw a little improvement. I did notice wax bar was wasted. Does anyone have any insight or clues as to what the problem might be. I'm thinkinf it my be blade or wax bar or charge unit. Thanks