Dishes in upper rack not coming clean, detergent not dissolving fully

My dishes on the top rack are not coming clean and the dish detergent never fully dissolves. I have been reading the posts but cannot locate the “chopper” on my dishwasher. Can anyone give me a suggestion on where to start with this model? Thanks.

Okay, on my model, it appears the chopper assembly is near the motor. I would not remove the spray arm for this correct? Am I looking at this wrong?