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If you are just talking about the door seal or the gasket. That part is relatively inexpensive to purchase and can be self-installed. So if nothing else wrong, not a bad investment. If you are talking about the main seal, like the tub, it would not be worth the repair cost based on the age. 11 years is a fairly good time frame today for a washer. So you may want to weigh that an average new duet is around $1000 today.