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This should correct the problem. I had something similar with a new Model Power N-scale FP7 and simply turned the motor over in the frame to solve the problem. Does your loco still have the brass contact strip from the underside of the motor to the frame, or has this been re-wired as well? If it still has this strip it may be easier to unclip the motor and re-install it the other way up - you'll still have to re-solder the wires you mention but this would be the easiest way to fix it.
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