Sounds like a failed internal electrical connection in the motor. You should be able to get a replacement motor from MTH - apparently one does better by calling rather than emailing.
I don't have any steamers with your exact motor configuration but it should be as simple as removing the 3 black screws on the horizontal plate at the bottom of the motor in your photo. The plate and motor lift out together and expose the gearbox. Then two screws under the plate hold the motor to the round black frame.
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