I would suspect that there is very little "proprietary" in the whole issue, given that the root cause (suspect hydrogen embrittlement) is a well-recognized and long-standing metallurgical phenomenon.
Factors unique to the GEnx (geometry, alloy, design unit stress ...) are the unknowns you and I can only ponder. The exact manufacturing process for this set of factors can only be guessed at by us, even though we probably know the basics.
I for one am content for GE and their FAA colleagues to ferret out the problem (without our help), and complete required inspections on-wing and off-wing. And if outside help is needed, there is a long tradition of consultancy between competing OEM's - to maintain the industry's safety reputation. (I am reminded of Douglas & Boeing helping audit the Lockheed L188 design during its whirl-mode problems fifty years ago).