Weigth your board, to have an estimate of a amount of water that entered.
Also try to open holes around the handle to ease the drying.
If you got a lot of water for a long time in the blank, it will be nearly impossible to get it out all again. If the leak is recent and act quickly, it may be possible.
The reference on this is the board lady: Real all her posts first on the subject, this is
mandatory:
boardlady.com/water.htmAnd ponder the conclusion:
" While substantially faster than any of the above methods, vacuum-drying can take months, if the water had a chance to migrate into the EPS beads: a Northshore Maui board with over 6 pounds of water in the core for half a year, took 5 months to shed 5 1/2 pounds. Don't wait!!". Buying a new board may be cheaper than buying a vacuum pump and the electricity needed to run it for 6 months (plus the noise...)