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See this AD from just 4 months ago for the T/R:
See this AD from 2016 about the T/R drive shaft:
For the LTE naysayers out there, I know UH-60's have had it at altitude and even CH-54 Skycranes have run into it. Conditions definitely have to be just right and a pilot being slow to respond will only make it worse, but it's certainly possible in any helicopter.