I was just doing general maintenance on my Raptor and when I pulled the plug, there was what looked like some white corrosion around the hex of the plug where it seats. This is the first I have seen this. You think it could have been some water getting down in there and causing that?

 

Water getting under the seal would be my guess. Make sure that little boot is on good and tight when you put it on (it makes a snapping sound when its as far as it goes). You gotta be careful though, cuz you don't want water getting into your cylinder.