I have a veryyyy slow oil leak, or at least I think I do. Since I had my desmo done, I've noticed oil around the valve at the front of the horizontal cylinder head (marked part #16 on this diagram). I've washed it entirely and cleared the area, but after a few rides, I notice the area is a little wet. No drips or pools of oil can be seen anywhere. I additionally partially took off the horizontal timing belt cover to have a peak and all is as expected. Has anyone had anything like this before? I can't see cause for concern, as it may just be residual oil making it's way to this point, but I'd like to be sure as I'm coming up on a few tours and this will be a ball ache should it get worse.