Both front windows of my XJC have parallel vertical scratches on the outside of the window near the rear vision mirrors.
Pulling back the the outside rubber there is a roller inside the door that has four protrusions and it is these that are causing the parallel scratches. I assume this roller is part of the system in the coupe windows to keep the window pushed in and sealed against the door frame.
Has any other coupe owner had this issue and what was the solution - I guess replacing the roller and if so was it difficult.
Every coupe has that issue, more or less. They can be replaced and they can be repaired. The front one is easy but IIRC the rear one requires the glass to be removed frim the door.
The rubber on the rollers hardens and gets dirty over time and that causes the marks on the glass. In my experience it’s always worse in the front. But glass can be polished if you want.
At the time I replaced all four in my coupe the plastic 1” bushes on the door glass fitting points / holes was NLA. Mine were a bit beaten, but fortunately not broken, so be careful with those if you decide to take the glass out.