Yes Max, what I meant was that it has two completely separate FADEC systems (ECUs and the rest), one per engine.
Generally a complete loss of power on two generally very reliable engines is caused by only one or two causes: the quality of the juice flowing through them or the lack of juice itself.
I shall refrain from making any comments, however I have a feeling that those "ponies" were galloping when the Grand hit the water and the problem was somewhere else.
It was dark, wasn't it?