I have a Frigidaire 4000 Series Aqua Surge dishwasher. The water won't drain completely upon completion of the cycle -- I lift up the filter and there's 1+ inch of water left in the bottom. As a result, there's a rancid smell from the standing water. I had a repairman come and look at it and he said that the dishwasher was installed correctly, operates correctly, and that there's nothing that can be done. He said it's designed that way. I've had several dishwashers before and this never happened. Any suggestions other than purchasing a new dishwasher?

Model Number: PLD4375RFC2. Please help!