I do not know for sure and I would get a couple second opinions before proceeding but ...
Water by itself may not have damaged the board at all.
The idea is to absorb or evaporate any remaining water.
Disconnect from power.
Fill the the box with instant rice (like Minute Rice). The rice will help absorb water.
Put the whole thing in a VERY LOW HEAT oven ~100f degrees and leave it for a couple hours. The heat will speed evaporation. 100f degrees should not damage the board.
Good luck.
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