Hello, a few months ago my very quiet dishwasher became not so quiet during the wash cycle. It started making a pulsating sound. This sound stopped during fill and drain. It was still under warranty when the repair man came. He took it apart and told that a piece of corn was stuck in the pump. He cleaned it out and it seemed to be ok. Now it is doing it again. I haven't put anything like corn in there since, thinking that was the problem, but now it's back. Does this sound right? Is it easy to take the pump off and clean it?

Thanks very much,
Adam