Sounds to me like someone put their housing away with salt water still in the system?
Not to worry, we have all done it!
I know from past experience that boiling water will remove electrolysis. . . . . BUT. . . . and there is always a BUT.
This is IMHO. . .
If you do this, you must immediately dry the bulkhead and then wash it thoroughly with alcohol and dry.
This is IMHO. . .
CRC or RP7 or WD40 or whatever it is called in Hong kong sometimes works also. (It is a contact cleaner)
Just remember that I'm not an expert. . . 
Bruce...