I appreciate you helping me think through this.  You helped me find the sysxlgns table - and I think Sue (below) has helped me get to a point that I...

Thanks Sue.  That sounds promising!  I can't try it until the morning though (parental responsibilities) - but I'll let you know how it turns out.

Thanks for your reply - but that was my first guess as well. 

select * from master_OLD.sys.server_principals returns the same result as select * from sys.server_principals
I added...