I don't know how the 18 compares to the 2011 regarding the coolant plumbing fittings, but on my '11 the coolant "tee" at the head started leaking and I thought that it was the head oring. Might be something to check.
Also look to see if the expansion tank drain/vent is pointed at the head as that can look like a leaking oring a well.
And lastly, I remember that Jakobi (IIRC) had a tree frog or whatnot on his bike that caused him to think that his bike had a leak.
So, it could be serious, or completely not serious. Good luck!
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Phil
(New bike pending...)
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