Engine Compressor Guide Vanes?
Could I recommend we should look at the part that the engine guide vanes play in the scheme of things. They have received precious little attention so far no doubt because of the concentration in trying to determine a single source for a two engine event.
Presumably the engines compressor guide vanes angular control is by the FADECs which are in turn are driven by dedicated computerised software. Wonder where the FADEC software is physically located.
Can someone describe the Trent guide vane system? How many stages of vanes and are they all interconnected? Over what RPM range do they do their thing? Are they hydraulic, fuel pressure or bleed air driven? Are they anti-iced and what is likely to be the effects of malfunctioning or non functioning during engine acceleration?