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LeeD said..
Where, on the board, is the water dripping from?
Weigh the board before heading out and after coming in.
As said, check vent plug washer.
Second LeeD, where is water coming from? You say a small amount, could just be water held in the foot strap holes (holes used for the foot strap screws and unused holes). Of course check the vent plug Oring, if it is good maybe it is not the problem. Try laying it upside down on top of newspaper or towels for 1-2 hrs and then check where water is wetting the paper or towels.