I work in the telecom industry and salt gets into everything just from having extra moisture it will let a tiny bit of salt to travel from one place to anouther. Telus closures on the coast are in bad shape that is why they have been replacing them on a regular basis. I would give them a good once over it only takes a couple of minutes to have a look and swob them. As I said if that does not clear it up you will have to open the controler and clean both sides of the circuit board. The manufacturer should have an rubber coating on the board but I see that mine doe not has one so I think it is an over sight on there part. Electronics and water do not mix. You can use clear nail polish to coat the board but if it over heats then it could catch fire more easily.