Are the engines being replaced...sent off to Turbomeca...overhaulled and sent back....with hot end changes or something similar? Any identifiable issues that could help point other operators towards the paths of rightousness or is it simply a bad engineering decision by the builder to use that particular engine?
You are correct that the 76 using the same engine is encountering problems with the engine making TBO....which seems to confirm your observations.
You might be closer to that consultancy than you think....but not with Turbomeca.