Sven Sixtoo
High Spirits
AAIB say "No evidence of mechanical failure".
No it didn't, it said ...
"
Initial assessment provided no evidence of major mechanical disruption of either engine and indicated that the main rotor gearbox was capable of providing drive from the No 2 engine power turbine to the main rotor and to the fenestron drive shaft."
... which suggests to me that there is the possibility that there may be something to find in the tail rotor drive shaft department.