Hey Pete,
The bike is 2012 SE and has been rollerized and valve checked as of late last season as part the 10k. Have put about 3300kms on her since.
I'll get a closer look today and check it again during / after a ride. I would imagine the coated surface above the screw that I highlighted in red is susceptible to the type of wear and breakdown on all our bikes.. It's not too bad and am probably just being anal.
thxs.