I too would be interested to hear a bit about this. I watched a programme on National Geographic the other day about an A340 which ran out of fuel over the Atlantic (crikey!). All ended well and one of the changes made by Airbus was a warning message which indicated when fuel was being "used" quicker than the engine was burning it...i.e. showing a possible fuel leak.
That must have involved some minor software changes?
Mav