Not entirely ... from the accident report they were crossfeeding (balancing fuel) with the autopilot on and manually applying rudder, which caused the yaw damper to disconnect - disconnecting the autopilot.
But this has already been discussed in other threads and I think the analysis has already been thrashed out.
What I am trying to find out is, at what point would there be an excessive imbalance that would make recovery from an unusual attitude such as this impossible (i.e no aileron control). I know there is a manufacturer's figure for maximum imbalance for takeoff and landing, but usually there is still some effectiveness in the ailerons.