Pulverized food particles were being left on the dishes in the top rack

FIRST I TURNED OFF THE POWER GOING TO THE MACHINE!!!! Then I removed the top rack by removing the (2) end caps on the front of the rack glides first then lifting the rack upwards and out. Next I removed the bottom rack which slid out easily. I then removed the lower spray arm that was held in place by the plastic turn-screw portion of the lower spray arm support/hub. I turned the screw a few times and the spray arm was released. I then released the feed tube assembly that was held in place by (2) clips; one clip was on the back panel of the tub (above the probe area) and the other clip was on the top panel of the tub (before the upper arm spray). Then I turned the entire tube feed assembly a quarter turn to the right so that it was possible to separate/unsnap it from the feed cap on the bottom. After the feed tube was moved away I was able to access all (4) screws that holds the accumulator in place. I used an allen wrench to remove those. After the accumulator was removed I saw two screws that was holding the 2-part protective cover of the chopper assembly. The small cover came out easily, the round cover took a little jiggling and fussing until I figured out how to pop it out. The chopper was revealed when the cover came off and I found it to be very warn and a bit bent. I pulled it out by pulling it upwards and forward towards me. At this time I also removed the valve check. To my surprise it didn't look like the one that I bougth to replace it. It was missing the round disk portion. I fished around thinking it may have somehow fallen off, but I didn't find anything. I put the new one in, disk-side down. I then put the chopper assembly in place and put everything back together again. I'm not 100% sure that it is completely back to normal. It seems to leave significantly less debris than before, but I noticed that there is more water on the bottom of the basin now. So it may not have been my only problem. If anyone has experienced the same thing I would really like to know