Thanks for that, much appreciatedI just looked at my 2019 1250GSA damper and it has a circlip in either end of the cylinder body, suggesting it can be rebuilt. The seal looks like a standard hydraulic rod lip seal, assuming its a standard size (presumably metric) they should be available over the counter somewhere. The oil is probably 5W or 10W shock oil.
Perhaps Denz0 could rebuild it for you, no doubt over time other owners will have the same problem?
Sadly I just reinspected with a small mirror, and found a tiny pit on the back of the shaft. So options 1 & 2 could be a no go
If they are and I end up replacing the unit. I might pull the original apart and throw up some pics with measurements of seals etc in case that might benefit someone else