The front cap / fiberglass roof seam is a issue for sure. I used Eternabond tape on mine since it's not visible from the ground.
However, I found, and a lot of others have too, that the roof radius on the sides at the end of the drip rail is a common failure point. It can leak in there on the radius and then travel around the front of the windshield, too. On mine, I found the factory caulking at the radius/drip rail had cracked and opened a hole that let water travel down the gutter and right into the interior behind the front cabinets.
We have had a number of recent posts about that here. I'll put a link below.
By the way, Dicor is acknowledged as the wrong sealant. Winnebago used Manus Bond 75-AM for years but now some professionals are saying Proflex Urethane or NuFlex 311 Silicone is the right stuff to use - though some say Nuflex 640 Thermoplastic or Stone Mason Gutter and Siding Sealant.
There is a guy on YouTube that has done a lot of these resealing jobs and you can get a lot of info from him.