I would pull your front panel and check your pump for a clog. If ok. I would check your belt for wear, then pull it off and check your tranny pulley, turn it one way then the next. If hard to turn in spin, you might have something caught in the tub. You can shine a light in the spin basket and look in the tub.
If everything ok, turn the tranny pulley in spin direction and watch the pulley turn up and disengage the brake. If this doesn't happen you will need a pulley/cam kit.
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