You may have a pump shaft bearing trying to seize.
You may have something in the sump blocking the grinder wire from turning.
Remove the plastic cover in the back portion of the tub.,2 screws come out.
Remove the filter insert.
Carefully feel inside for an obstruction. It could be broken glass. There may also be a piece of string or plastic wrapped around the grinder wire.
If there is no obstruction,the pump seal may be the culprit.
It is not replaceable,the pump/motor combo is replaceable.