Thanks BCMGuy...always helpful with the advice.

I just briefly changed our service sched to confirm...and it is definitely "Access Denied", not "Denied in Admin".

No ringing service key on 228, no stuck buttons. 228 is also not a control set for any line or set.

As far as I know, the system hasn't had its power cycled in about four years now - so perhaps that's it?

To what device does one backup to on a Norstar? I'm pretty sure this has never been done at this site.