How clean the filter screen on GE Triton XL dishwasher?

I had a repair man come out because dishes weren't washing. He checked and there was sediment in the intake screen of the dishwasher. It's doing it again and I'd like to just clean it myself, but I can't find any manuals to show where this is at, and I'm not going to take it apart until I know what I'm doing. Does anyone know where I can get a manual to show that or do you know how to clean this? Thanks!