GE not draining all the way

The cycle seems to run normally but there is quite a bit of water in the bottom after it’s done. You can hear the water draining during the cycle and we’ve taken apart the bottom and while we did get a bunch of crud out, that didn’t fix the problem either. I’ve read about a piston nut and a flapper valve as possible causes on other models, but don’t see either one of those parts on my model’s part list. What else should we try or look into replacing to get the dishwasher to empty out all the water.

Thanks - Robyn:confused: