AAC => Commonly referred to as AALLC => Alexandria Aircraft, LLC
They are the owners of the Bellanca Viking Type Certificate and are referred to as the "factory". They have parts and will still build you a new Viking if pay them. (2005 was the last one they built).
Website:
http://www.bellanca-aircraft.com/
Phone:
320-763-4088
Where:
Alexandria, Mn
Now, the mufflers can only be fixed by Aerospace Welding to remove the recurring portion of the AD other repair shops will still have a 50hr tear down inspection.
Call AALLC and talk with them.
-Ryan