dark green would indicate your tensioner paddles, howver note that there is a light green seal associated with it.
Porsche Boxster Cam Towers & Timing Chains - Page 1
given that this is a more typical wear item on the boxster i would suggest looking here before valves.
rattle at start up, or big time cam deviation on the durametric - tensioners.
low compression - valves.
dunno who you are using, but if it is european specialty they don't even have a durametric or pst tool (or didn't last time i checked). further, most of their experience is with air-cooled porsches so they would defer to that experience (ie, look to valves as the issue) instead of the common failure points in the m96 engine.
ps, i've read someplace in the internet that porshe uses a sealant of a similar colour, and that sometimes it shows up in the filter.