The only thing you can do is to re-flash both images and start from scratch, maybe the OS has been corrupted because of electrical short and untill you do a re-flash you cannot realise if permanent damage has occured.

In any event your warranty is void due to accidental damage so unless you are insured for this your only hope is to try and re-flash, apart from that i do not suggest you solder anything, WHY? water does not make loose connections unless it is over a long period of time then corrosion sets in, do a proper wash of every component and re-assemble.

Better to do something than nothing.