This is only my second post, so forgive me if I appear to go over old ground.
I fly for fun, but my real business is power.
I know elsewhere, that wax has been targeted as the culprit, and in my view, this is partially correct.
When wax forms in fuel, it is also the fraction of the fuel with the most heat, that has been effectively removed, and the heat left in the remaining liquid will be at a lower heat value, and this could be further aggravated if the remaining fuel has in fact separated into its other fractions, with the worst fuel( lowest amaount of energy) being at the bottom of the tank.
The result, in my viiew is that the FADEC worked fine, but the amount of fuel pumped into the engine lacked the required energy (kJ) to meet the power demanded.
Just my 2 cents worth from a dreaded PP.
Cheers