My dishwasher model SHU66C05UC is not getting water to the top rack. I places cups in each corner and middle of the top rack and not a single one has water in it. I pulled out the filter, cleaned the sprayers, pulled the impeller cover and found no debris, the piece that carries water to the upper spray arm was also clean and free of debris. The machine is making a louder sound than usual. It is draining. Any help would be greatly appreciated. Thank you!