Geoffers - as an example of what you describe, the 365 RFM doesn't differentiate between a TR control failure and a TR drive failure (loss of thrust) - it is wrapped up into one drill which advises a running landing with a left sideslip on approach and if possible a wind from the right. There is no mention that you will have right sideslip with a drive/thrust failure and no consideration of an EOL for some control/thrust failures at all.
Back to the 92 and the question is how did that vital bearing get to that 'distressed' state without someone noticing something (apart from the crew when they lifted to the hover and convinced themselves the wind was responsible for the undemanded yaw).