Circle Dance? Not sure what's wrong--it acts like it's bumping into walls. Rolls forward a foot, then backs up, turns, does it again. The bumper is not stuck and we've tried forced air cleaning everything we can get to. Someone mentioned sensors under the roller (two metal discs, but we don't see them). Please help. We need a schematic of this machine or some instructions for taking it apart so we can get to the sensors on the wheels--or whatever needs to be cleaned.
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