I traded in the old dishwasher for a Kitchen Aid Serial # FW4305915 and the results were dramatic. I got a quiet cycle with a fraction of the insulation and clean dishes and glasses to boot. This was 4 months ago now the top rack is not delivering clean dishes , if there is chocolate or tea crud in a cup or glass its waiting for me after the cycle. I do not think the dishwasher is to blame and by the way I am using rinse aid. I think the kids are allowing too much food residue in with the dishes and something is plugged. Is there any way to check this out can I by pass the door switch and get this sucker to run with the door open so I can see if there is flow. I think there is something called a chopper how can I clean it. Sorry I did not include a model number I can get that as well if it helps.