I could, it would just be hell getting to all the spots.
I would also prefer to seal the leaks, and let the rotted portions
remain completely exposed.

I think I can raise the upper panel enough to slide in tape, or felt,
or membrane.

Its going to be 50 and sunny for probably the last weekend here in
central NY, so whatever I'm going to do, its timne to do it.

See my roofing thread for another idea I had (I shamelessly bumped it)

-Dave