The thing about Sunbeam Service Centres is that not all of them are trained to service the 6910s.
I read on here last year sometime that one of the unauthorised ones had ago at someones machine and it was a drama and a half. I understand Sunbeam were none too happy with his conduct.
The only "Authorised" Sunbeam repairer I know happens to be fairly close to you.
Hes in Ashfield.
Hes serviced the work machine and Ive had a few chats with him.
He seems to know what hes doing.
Google "sunbeam repairers ashfield" and youll find him easy enough.