Does this roof need work?

From what I felt the decking felt solid. Wall under delam also felt solid. There had to be some rot on the back though I suspect for the ladder to be loose but I did not feel/knock around to much on that wall. Price is $9,900 could probably get for less. 29 rear kitchen model. I am not afraid of putting some money into it...but how much is too much. I don't want to replace walls.

I suspect the roof is drying out and not leaking yet...but how soon will it leak.

Thanks for the heads up on the light being the source for the delimitation !