OKay I got that info on the incident of torque fluctuations that I mentioned.
I quote the reply given to me by a man who knows...
:
"These were large fluctuations (torque), due to loose engine mounts, very unusual. The fluctuations were due to drive shaft going in and out of alignment with the Main Gear Box.
It's an oil pressure system, so otherwise leakage/blockage/low oil px.
"
Hope that helps in your search for the cause.. let us know what you find.