The wire size does not look to be correct for a 25 amp breaker. I think the pump motor was failing and pulling too many amps. Because you had a 25 amp breaker the wire failed before the breaker tripped. With a 25 amp breaker minimum wire size is 10 gauge.
So I hired an electrician today and he upgraded the burnt wire to a thicker AWG and so far she is running great. We can close this case. He confirmed the wiring was all correct and out a multi meter on it.
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