Kitchenaid DW won't drain

I have a Kitchenaid kudm01tj bl0 dishwasher that we just noticed is full of dirty water at the bottom of the tub. We put it on “drain” and you can hear a faint humming sound under the dishwasher, but no draining. I pulled the hose from the garbage disposal, and it is not clogged. So I called a repair company who I wan’t too impressed with. They spent just a few minutes looking at it and assumed that it needs a new drain pump, and quoted $325 to do it.

The pump itself is about $45, but I have no idea if that would fix it, and if you think so, how difficult are those to replace for someone with limited skill? Is there something else I should check before going forward with replacing the pump?

Thank you!

I would remove the drain pump first and check for a foreign objects inside, and if there nothing there, I would replace the drain pump.

If you are somewhat handy this is not too difficult part to replace yourself. The Service manual might help you as well.

Here are the breakdown diagrams and Replacement parts for WHIRLPOOL KUDM01TJBL0 | AppliancePartsPros.com

Gene.