No help with the "tic" but everyone seems to agree that the valve cover gaskets are robust and can be used until and unless they show signs of cracking or other damage.
Not sure about the cam chain tensioner. Could check that. Will be taking her apart tomorrow afternoon. Do you know any guides for R1200GS can tensioner and how to spot if its broken/damaged/worn? ThanksWhat Crucian said regarding valve cover gaskets. While I had a spare set on hand just in case I never used them on my '05 GS. The guy I sold the bike to didn't use the spares, either. Same gaskets for 120-130K miles. I did rotate the inner "donut" every time I had the cover off.
As for ticking noise --- could it be the cam chain tensioner?