others have had issues like this in the past and some have been fortunate enough to get the unit functioning again by drying it out thoroughly. To pull it out, you'll need to remove the seat. Then unplug the unit and dry it out completely before retrying. Pop it out and take the cover off. Let a fan blow on it for a few days to get all the moisture out of the circuit boards. While waiting for it to dry, clean out all the drains (front - under cowl & rear - under clam-shell to prevent this from happening again. Also check to see the foam liner in the conv top storage compartment isn't torn.
Once the box is dried out, you can plug it in and see if it (hopefully) will work. If not, you'll need to replace it which can be a little pricey
Good luck!