Roof sag behind ac

[DanielM]

Newbie to the group. Purchased an otherwise great 2619, but with one problem. Was about to replace roof seal and noticed sag.
I know this topic has been addressed sometime ago, but I haven’t seen or am unable to find the fix for this other than the crazy suggestion to replace. The rest of the roof is in great condition, no leaks. It is the area directly behind ac unit. It has sagged down about an inch from horizontal. The wood that is used to install seal is solid. I’m thinking perhaps aluminum “c” channel bent into arch to match crown of roof with some minor trim mods. Has anyone come up with a solution for this. If not, I’ll be diving in the fall and will post pics of progress. I’m a skilled fabricator so it should be doable. Any thoughts, ideas or suggestions would be greatly appreciated.