If your electronics ended up in fresh water, you may have a chance to salvage after drying thoroughly. However, the reliability of those components and boards is now under question having gone through a variety of shorts (most likely some ions in the solution). Anyways, you have to thoroughly test everything if you want to use it again. The problem is you can't easily test the full set of vectors. And that is why I would send in something like the ECU and probably the RX. my 2c.