Dishwasher won't drain

Dishwasher Repair
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1

I can hear the motor hum during the drain cycle but the tub does not empty. I think It may have an obstruction. How do I remove the lower wash arm assembly so I can check the pump? Also the pump and motor both seem to work fine during the wash cycle.

2

The first thing I would do is remove the bottom panel and check if there was a leak through the pump seal, causing corrosion to the motor.

Here are the break down diagrams for the Maytag dishwasher Model MDBD820AWB

Gene.