Hi thanks for the question.
Does it still wash the dishes .Are they clean.
Take the nut off the top and the screws and check for a worn wash impeller.If its clean in the pump housing then it could be the main motor.
What should be cost if impeller, and what if motor. I dont do repairs myself.
The impeller is $ 9.00.
Depending on the area you live in service calls are different prices.
Call Maytag and a few other service places and shop around for the best price.
An average would be $ 70.00 for the call.