(This is from memory so bear with me. I haven't worked on one of these in a few months)Looking inside the dishwasher, on the bottom, unscrew the filter and remove the metal screen plate thing. On the left hand side there should be one Torx screw holding a white plastic piece in place. In there is the drain pump impeller. Make sure there's nothing clogging things up in there. That's the only place that would have an obstruction.