Dishwasher wasn't cleaning on top rack. Repairman said it was the circulation pump and he was checking pricing. I don't have alot of knowledge when it comes to dishwashers. I took off the filter on the bottom and looked into the hole to the right side of the dishwasher using a flashlight and a mirror. It looks like there is a blue soft plastic inside the hole. I can't feel the impeller when sticking my finger in there. Is this plastic supposed to be there or is it debris that is blocking the water flow?