Been living with this for a while....glas.ses never get really clean, oftentimes there's detergent & crud on the upper part of the door... but lower rack stuff is fine. I can tell the upper 'arm' (little plastic 'yin-yang symbol' shaped) isn't spinning at all.

I've already checked the chopper, it's fine (replaced it about 1.5 years ago), as is the rubber 'check valve' thingie that's next to the chopper. We're good about pushing the upper rack all the way in, so it engages one of the two holes. I've checked the plastic 'pipe w/the upper arm...there's no detergent or other gunk clogging things up

I just can't figure what the problem might be! Part of me thinks it's the pump...something blocking something inside it, past the chopper...but I can't figure how it would be working at, say, half-strength; I'd think it would be all good, or dead.

Is there somewhere besides the chopper where gunk/stuff clogs something up & reduces the flow/pressure?