I've got a whirlpool Quiet Partner III that just buzzes the entire time its running. I had a person come out and check it out and they said the motor was going and i needed a new motor. (i didn't have a lot of faith in the repair person and felt like they just wanted to sell me a new dishwasher) what could the constant buzzing be? Could it be the motor, another part inside perhaps? How difficult is it to change a dishwasher motor? (I'm pretty handy)

Thanks for any input