My Rooma Discovery 4210 has one slow-moving wheel--one of the two spins just find, the other slowly. I can't find an obstruction, but I can't see what might be lurking between the wheel and the black plastic that covers it, either. I called and Roomba told me the wheels of the Discovery models can't be fixed and suggested I buy a new Rooma 500-series, which has fixable wheels. They didn't recommend trying to repair the wheel. Well. Thanks, Roomba. Given that this machine is otherwise useless, any suggestions on how to get that wheel unstuck?
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