Ya Jerry, thanks....
It's a head banger for me. When I originally thought fire, I did quite a bit of scraping here and there, but its difficult to tell much even by scraping....not like the paint will peel off so you can get a good look.

As you commented, that is a lighter colored patch up there as well...almost whitish, but it was over top of the green. Another piece of sheathing (no Photo) showed a purplish color.

Mold could have been a factor because as I said earlier, the three bathroom vents empty into this space. The ventilation is very good with gable and roof vents, but I also know moisture will do its thing if it can.

Getting a scab on this old head from scratching!

Think I'll have to let this one go....so I can sleep

Thanks for everyones input, I appreciate the help!
Rick