Motor sounds like it is straining '
When you get a chance, please post the whole model number of your Maytag dishwasher here.
Because you are still getting clean dishes, you probably have debris (a bone or fruit pit) that has gotten down to the pump/impeller or the chopper area.
Remove the lower spray arm, remove the filter/sump assembly and clean everything out. With a flash light, inspect the whole sump area for debris. I bet you will find stuff there (beware of broken glass!) and when you re-assemble, the noise will ne normal.
Good Luck! Please post back what you find, OK?
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