This post is directed toward those of you that have a few hundred hours or more on your RD2-x gearbox.  I'm getting "smoke" streaks leading out radially from the circle of rivets on the flywheel adapter plate on my 20B.  Do others find these streaks on their adapter plates?  I'm wondering if the rivets are working loose and need to be replaced or upgraded.  Maybe I need a beefier adapter plate.  Am I worrying over nothing, or is this something that is headed for an in-flight failure?