RunningMan:
I'm wondering if things have been provisioned to other than GE1 (LAN1) - that 100/100 profile can crop up I think if a second port is used on a Chorus ONT.
ONTs are something of a mystery to me (why does it have two wires going in, besides the optical cable -- no don't answer that). Now that you say it, I can imagine/believe that different LAN ports might/can have different profiles.
I'm rather impressed at the quantity and quality of the responses I'm getting here. I didn't mean to get folk in to full 'fix the problem mode'.
What a friendly place.

