Those levers hit a micro switch inside the door! It's either on or off no in between! The switch sends power to the valve in the back at the bottom. Its possible that the valve is not closing all the way OR you have to high a water pressure causing the valve to open just slightly.
Is the valve that you think is not closing all the way difficult to reach and repair/replace? Thus far my examinations of the water dispenser have ended after removing fiberglass insulation and seeing a difficult looking (wires and such) next step.
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