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I'm backing up the 'check the motor connectors' suggestion. Often they are semi-loose fitting and can pop off the terminal while playing or even just transporting (or shipping). If you find one off, take some pliers and give the connector a gentle little squeeze, then put back on the motor making sure there is a bit of resistance. Then arrange the wires so the grip plate goes back on without jamming them, reinstall and try it out.
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