The Certificate is based on Data. Ignored or unaware, the applicant needs to supply this data. It is forthcoming. The bottom line is Spline Wear. The engine had an oil fire in test. The engine exhibited some anomalous vibration and resonant transients that beat it to a pulp over shorter than allowable (and Certificated) time.
These are the issues, and the rest is corn soup. Who expects a problem of this magnitude to casually enter the Public Domain?? Nice discussion, though.