The first thing I would do is remove the pump and look for any obstructions. There maybe something down in the pump blocking the drain pump, basically timing the pump out, thus leaving water in the bottom to sour. Until you can get it figured out or repaired I would also wash the dishes by hand(have kids?), with dirty water in the bottom of the tub could also mean it isn't cleaning your dishes good enough(leaving dirty water on them)~just a suggestion!
Nat
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