Replaced with a new Inlet Sump [WD18X213]. It was a little tedious, attaching the Inlet Sump, back to the pump, because I did the job with the dishwasher in place (not pulled out). My dishwasher was plumbed with copper pipe, so I really didn't want to upset that. Also, I had previously replaced the motor and the pump in this dishwasher, so I was familiar with how the Inlet Sump attached to the pump. Again, it's very tight working under the unit while it is still in place, and I wouldn't recommend it to someone that had never been on the underside of their dishwasher.
I actually pushed the bottom of the new Inlet Sump (with clamp in place), through from inside the tub. Then I seated it in the groove in the bottom of the tub, and replaced the grid panels that had been removed to access the Inlet Sump. Once I had the top portion in place, I reached under, and around behind the pump and worked the Inlet Sump onto the opening on the back of the pump. Once in place, I tightened the clamp which holds the two parts together. It is important that you have the clamp in a position, which allows you to get to it with a nut driver or small ratchet. I found that the best position for this is to have the tightening bolt at the bottom of the Inlet Sump, with the head of the bolt to the right. In this position, there is just enough room to get your hand under the unit, and access the bolt from the right side, with a nut driver.
Again, a bit on the difficult task, due to my particular circumstances, but this job would be a piece of cake, for someone that could easily pull the dishwasher from under the counter and lay it on its side.
By the way, my new Inlet Sump arrived very fast ! Thanks......