Hi Madrock
Here's the link to the FAQ that Bristow released back in October last year. The pictures clearly show the (s/board rear mounting foot?) as the failure point (IMHO opinion where the most shear forces will be present).
http://www.oilc.org/Updated%20S92%20brief%20191009.pdf
Don't know if any AMEs are reading this thread or the MGB crack one, but I know that there at least a few PPRuNe members who have hands-on experience of their own inspections. With one fifth at the last count of the global S-92a fleet with this issue, including 25% of the 19 UK units, there surely must be enough physical examples and HUMS data to correlate a root cause. So why the delay from the manufacturer....
Fly safe
Max