Well I got around to doing it. The transmission was "clunky" with a periodic unevenness you could feel through the pedals, clicks and so on. I was convinced it was the BB.
I'd rung SJSC and they said to change as if ordinary BB. My eccentric screws were pretty tight so I did.
When I removed the old (9 months) BB, which took a good bit of force.. don't forget right side comes off clockwise (I've had 'em last for 10 years) It felt nice and tight and smooth to turn, but I replaced it anyway and lo and behold, smooth as silk. Clunkiness gone. Something that can chew at your innards when you're climbing a nice quiet hill!
No problem with eccentric.
It's useful to have this stuff online.