My Dell C1765nfw has started to make a loud creaky noise when it prints a page. At first the pages were also torn in the top right-hand corner, but that has not happened in the last dozen times. The same happens when I copy a page. The noise seems to come from inside the top right of the printer. I've opened it up as much as I can while it prints, but I can't any obvious problem. Does anyone know what could be causing this and how it can be cured?
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