I just noticed last night what may be a crack in the top tube/seat tube lug on my PSV10. It is about 3mm long. I looked at it extensively with a magnifying glass, unable to tell if it's a small nick/gouge in the paint or if it's indeed a crack. The 'crack' appears to be only on the surface of the lug. When i look along the length of the top tube towards the rear of the bike, the crack is not in the wall thickness of the lug. If this is indeed a crack, will it get worse as to be unrideable?