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IS the vent hooked up to any other vent or is on its own?
OK the only way condensation can form like that is if the outside air wherever the vent pipe terminates to it is really cold or really humid. That would blow air back through the vent into the machine causing that problem especially if you do not have a good flapper system on the outside vent. The only other thing would be if the basement is extremely cold then the warmer air from the outside would enter the machine through the vent and also cause that issue.
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