So, an uncommanded fuel dump a possibility?
Any commection with an incident in the early days of the A340? AF 340 over a Pond somewhere starts dumping for reasoms best known to itself. The advice from Toulouse is eventually to shut down an particular engine (Only way to depower a particular bit of essential electrics that was powering up the problem!).
Hotly denied at the time by the Ministry of Truth at Airbus
Very good show by all the crew--(don't forget the Cabin Crew)!