"I will have to remove the body from the frame to find what is loose."
Always good to put this near the top of the check list.
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The way I check continuity on rollers when one is suspect is with a multimeter - quick and dirty; if there is no continuity between the rollers, one is not connected internally, as their wires each go to the same place on the board. This will not tell you which roller is dead right off the bat (especially with only 2 rollers), but it will let you know whether or not to look into it any further.
