Remote Helicopters in Slave Lake (in 2003) had an AS 350 cyclic hardover on the ground where during the preflight checks it motored over to the left and could not be pulled back. The same happened to a Canadian Helicopters one in Fort Nelson (or Fort St John). It may have been a contributory cause to the OMNR fatal accident in Ontario, and the USA news AStar that crashed so magnificently on top of a building.
There was a whole spate of these and even though there was a lot of testing I still don't know what the outcome was.
Phil