I would give all of the electronics a try after they dry out.
I had a plane spend two weeks and three thunderstorms in a tree, The frame was a total loss but all of the electronics I am still using and have no problems with them.
I once had a battery solder joint start to fail and got the same reaction as "The servos reversing for no reason".
Hook them all up and run a battery dead moving the controls...if you don't have a problem-
keep on using them. And try to keep the antenna off the ground.

But I'm new also...so just thought I'd toss an Idea in.

Good luck.