In case you missed it...five posts before yours....I asked if there were any Test Data from Flight Tests or Proving Tests that would support Gouli's suggestion that unstable air over the North Sea might be playing a role.
He said he knew of none.
We did not "rebut" his argument but offered a response each based upon first hand experience.
You might read back through the thread and see where several of us have questioned the design criteria the AH Gearbox uses and question if ALL of the possible stresses and loads have been considered adequately.
Instead of playing Don Quixote....what are your thoughts to Gearboxes on Helicopters in flight and exactly how rough air might affect them as compared to Windmills firmly attached to the surface?