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Alfred, it is probably standard design. There's a tiny magnet or two in one or two of the paddle baldes, nothing to go wrong there. And a coil in the base of the impeller. If water has penetrated the coil--it is shot, you don't want to try un-embedding it and rewinding it.
As a "hail mary" you can cut the wire off a few inches above the impeller, see if the defect is in the wire and not the impeller, and is so just replace the wiring run. Sometimes the wire has rotted out from being in the wet, or being stepped on too many times.
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