Frigidaire Dishwasher - not cleaning dishes

My Frigidaire Dishwasher Model # MDB125RGS0 is not cleaning the dishes. It makes a “humming noise” as it operates (different than before). Any suggestions on repair?

Remove the lower spray arm, the filter and the volute cover. Check for a foreign objects inside.

If there is nothing wrong then the pump & motor has to be replaced.

Here are the break down diagrams for the Frigidaire dishwasher Model MDB125RGS0

Gene.