Washer not Draining or Spinning.

This is a washer that is continually having issues where it stops before certain cycles. Sometimes before the first drain, sometimes before spin, other time it won’t spin or drain at all. Customer said they can normally open it up, set it to where it needs to be manually and it’ll go again. What parts should I take with me before heading there? I’m hoping I have it already and can save us both an extra trip.