Well, I did fix my charge port lights with this one simple weird trick... I sold my S and bought a 3.
Sorry I don't have a better answer.
I'm told the issue is: design flaw allows water to get places it shouldn't. Which would not be a problem, however the water freezes and damages things... I can say there are fewer lights at the charge port on my 3. (and it's worked fine for 6 months).