I just launched my salvation project, a 1977 o'day 22. When sailing in a stiff breeze we noticed that when we looked down in the bilge, the windward (in this case starboard) portion of where the sealed keel hits the inside of the wall of the bilge, there were some bubbles. upon closer inspection it appears a small crack is the cause. on the other tack there is no evidense of a crack on the port side and no bubbles on the starboard side. The keel on this boat appears externally to be sound. The keel is an enclosed keel and the bubbles seem to be just from existing moisture, not "new" water from outside. Anyone have thoughts/comments fixes? How serious is this? Is it common? Thx.