Funny noise diagnosed by tech

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

Depends on which pump it was in. Bosch dishwashers are by FAR the most difficult to work on, the drain pump is only serviceable after removing the unit from under the counter. There could still be something in the pump!!! Have the same tech look at it again.