I haven't taken the flywheel loose yet, it's still attached to the crank. Bearings look and feel good. Replacing crank seals, even though they still look like new. The fuel line is in new condition/carb boot is in new condition. Inside of sprocket clean with very very little wear from clutches. IMHO, this saw hasn't seen much use at all. Heck, the plastic doesn't even have any scratches on it.
I took the guy's word it was straight gassed. Fuel resevoir had little fuel left in it and it was definately pump gas w/ no mix at all. Not sure where, or how it developed an air leak. Everything seems like new and was tight fitting. I don't have a vac/preasure tester, so I'll just be putting it back together very carefully. I'm sure with much more care than it was originally assembled with.
I'll get some more pics up of the muriatic bathing and massaging, as soon as I can find someone with some acid laying around. Gotta get to scrounging and bothering neighbors now.