Cold weather fuel system leak

'08 C50T

New to me bike. Had a few cold spells here in FL over the past few weeks. I began to notice a fuel smell on the way in to work, while at stop lights/signs. Looking down at the left side, generator cover, I see an oily smudge on the chrome. The warmth of the crankcase dries it up quick, just leaving a residue. I did catch an actual drop falling onto it once. This doesn't happen in warm weather and can be verified by the lack of the smudged chrome on the genny cover. I'm guessing it is a minor leak in...


1. The fuel rail - 6
2. The rail plug- 9
3. The upper or lower injector rings -3,4

And I have yet to SEE it in action as it only appears while driving for a while in cold weather. If everything is warm, it doesn't happen. Which could be as little as stopping, getting off the bike with it running, and it has already warmed up enough to stop leaking.
I can't even tell ya if it's the front or rear cylinder since they are packed around the throttle body in close proximity to where the drip happens.

I guess I'm asking if anyone knows of a common trend/failure to narrow down this little bugger?

Thanks!