Elderly guy 1997 Harmony roof leak

James - before you take any drastic actions, what specific evidence do you have that the leak is coming through that joint? It may well be that you can see evidence of rust, or bulging of the high top where it meets the body of the van?

Is the rust stain purely on the outside, or are you getting rusty water inside as well?

I ask because it's fairly rare to get significant leaks along that joint, and leaks around the high top windows are far more common - and can sometimes be deceptive, as the water can track quite a long way sideways.

At around that time I think that A/S used two different systems, but I'm not sure why. The one on my Flair of around the same time was mounted on stainless steel stand-offs which were bonded to the lowest part of the roof, with nylon bolts holding the outer (thin) moulding on. But there were others where the moulding appears to be bonded directly onto the gutter - which seems to be what you have.

There have been a small number of threads here in the past where people have tried to remove the latter type, and from what I can recall, they simply break. I can't recall anyone describing a way to get them off complete. So it may be that you will have to cut away just enough of the moulding to be able to access the rusty area, and then bond the piece back on when that's done.

I'm sorry that I can't suggest anything easier. It may be worth doing a forum search (for example for "gutter trim" or "gutter moulding" or "roof moulding") to see if anything turns up that I've not seen, or have since forgotten.

Good luck!