Spoke with my CAMO yesterday and he was unaware of this. How does information like this get disseminated out?
You can register with Cessna
here. You will then receive email when new service bulletins become available, about one email a week. You can also search the database of past service bulletins.
In my experience, most shops don't care much about service bulletins, they focus on the mandatory stuff only, i.e. ADs.