I have a 3 year old Kitchenaid Dishwasher that has recently become very noisy. I reviewed comments on this site and checked the area around the macerator blade and screen. I found two small chips of glass in front of the screen that I removed. I reassembled and found that the noise was still there. I believe the noise is in the impeller motor unit and wanted to see what my next step should be. Thanks in advance for any help/guidance.