Last week I parked my car facing up a slight (~10°) hill in the rain. After the rain there was ~1/2 liter of water on the floor, and more drained out from under the driver's side dash when the car began to move. I checked for leaves or other blockage to drain holes under the hood, but everything looks clean. Mercedes dealer reports there is no service bulletin about this problem. Does anyone have any insight into this or the solution (never park outside in the rain, right)?
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