The Yankees are conducting their own investigation into how Carl Pavano broke two ribs, and whether he actually broke them during the Aug.15 accident near his home in Florida as he claims. "It's a very strange story," a Yankee official told the Daily News. "It seems like there might be more to it, but you just don't know. Maybe there isn't. At this point, it doesn't look like we would have any grounds to void his contract."