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Is the water actually leaking from the fill box? Or is it leaking from the tub behind the fill box?
It could be coming the part that goes thru the side of the dishwasher
OK so it sounds like the inlet seal has just worn out and needs to be replaced. If you open the dishwasher door and remove the bottom rack, you'll see a round vent on the left side on the opposite side of the inlet assembly. This vent just twists hard counter clockwise in order to unscrew it so you can remove the inlet and replace the gasket behind the vent. Below is a link to the gasket you'd want to order for your model number.
CLICK HERE for gasket
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