Replaced the Inlet sump. First I watched a few videos, both Appliance Part Pros and Utube. Uninstalling the dishwasher was the hardest part of the job. Replacing this part was fairly easy and could be done from the bottom of the unit since it was connected to the dishwasher with a hose clamp.
I removed the sump filter from inside the dishwasher anyway and cleaned it with a brush. Most of the holes in the sump filter were filled with what looked like a soap - grease mixture. The was quite a bit of that mixture in the inlet sump part too.
Our dishwasher is almost nine years old. It now seems to be cleaning much better. So, spending $30 on this part and taking about 90 minutes to both install it and clean out internal parts the dishwasher saved me, at least for now, about $500 for a new dishwasher.