https://www.reddit.com/r/Roofing/comments/1focnk1/sheathing_lifting_can_i_fix_it_from_inside_the/
No, gotta remove the roofing materials and secure it properly. You try doing it from inside, you're still going to have nails and staples popped up creating a ...

https://m.youtube.com/watch?v=X5vQUtjDars&t=47s
In this video we will demonstrate How-to Roof Repair bad plywood decking caused from a roof leak. We take you step by step minute per minute ...

https://www.finehomebuilding.com/forum/patch-hole-in-roof-sheathing
2) From inside, cut a piece of sheathing closely matching the shape and size of the hole in the roof deck, plus a larger piece of sheathing to ...