I think the Apex Outfitter is a popup roof camper, and I think the roof is one piece composite materiel,
Not if it is 11 years old. Outfitter changed the design from "traditional" to a one-piece composite roof around 2010.
Of course you can get under the AC ... you need to take it off. Any band-aid style fix will not last long. You will probably need to strip the roof down to the bare TPO, remove the TPO, and replace or repair any damage you find underneath. I agree that any visible leaks have probably been invisible for a long time beforehand, and that there is significant damage in the roof that needs to be adressed.
The camper shell is aluminum framed, but I am not sure what the frames of the older roofs were made of.
Any chance to take it to Colorado and have the manufacturer put a new roof on?