The extractor bolts in the SRM arms are not Dura ace. I had the SRM provided bolts loosen a few times, but this was before I bought the second unit so I didn't have to be constantly swapping it between bikes (I had a spare non-driveside arm on the other bike therefore was only swapping out the SRM).
Just grease the bolt threads, torque and check every now and then.
Only thing I'd be concerned with is how the extractor bolt is sitting...