Removed dishwasher from counter mounts (two screws). Shut off water supply and disconnected drain line. Removed drain pump and cleaned. Unseated, cleaned and re-seated backflow flaps in the drain line. Disassembled drain line (mounted to dishwasher) at lower elbow joint. Removed debris and cleaned trap, unseated, cleaned and re-seated backflow flap. Reassembled all. Replaced tub and door gasket. Reconnected all supply and drain lines. Drains great, washs great, no leaks, no standing water, no issues.