**Two of them are under the carpet, close to the front of the front door on either side. So, just pull up the edge of the carpet, and you'll see them. The third is under the lower part of the dashboard, on the driver's side.
Indeed, since you're dealing with a water infiltration issue, I would suggest that you do what I did when I had that same problem. Remove the seats and pull out the carpet. Also remove the plastic trays that guide the cables. Dry everything under there and let the car finish drying for a week, preferably in the sun with the doors open, if possible. Likewise, hang up the carpet to dry; this will likewise take about a week, because the foam will have absorbed the water.
Once the interior of the car is thoroughly dry, then use a wire brush to scrub every electrical contact that you can possibly find. That includes the CAN bus connectors, the pre-fuses in the passenger footwell, the rear SAM (computer), all that stuff. Scrub it all. I actually disassembled the rear SAM and scrubbed every last electrical contact, including each individual fuse and its connectors, one at a time.
That's the only way you have a chance of fixing your electrical problems.
Did your reed valve get clogged and thus water overflowed into the passenger side? If so, then it's also a very good idea to just remove that accursed reed valve.