Make sure everything is out of the sump, also stick your finger in the hole to the left in the sump, and see if you feel any food or anything in there. If there is you can find something to stick down the hole that the fine filter goes into and try to poke it out into the sump so you can grab it. By running it with all that taken apart if something was in there it may have passed through, so you might be good....By removing the lower spray arm you create a pressure difference, that's how I can tell if something is in the sump or elsewhere. If it drains with the spray arm off, it is in the sump...

As far as general maintenance, as long as your not putting food like lettuce or big chunks of stuff in the washer you really wont have a problem.

Now you need to take off the white nut that is above the fine filter, remove the fine filter. Then the hub that has the spray tube attached to it, turn it to the right a bit and pull off that tube that runs up the back wall. Pull off the plastic screen and there is your sump. There is an insert in the sump that that screen clipped to, squeeze that and pull up, and clean it. now stick your hand down in the sump, and pull out whatever it is that is clogging the drain hole.