the argument is moot when the norwegian themselves called the fault on EC before even finding evident and EC duly complied with demonstration that it is very unlikely the few early theories the norwegian thought were the root cause to the event. The continuing no finding only proof that it has nothing to do with the design and build. Only people with agenda is pushing such idea till today.
talking about HUMS, it is not as easy as some people here would like it to be. It is until today still a brilliant idea that never been reliable in actual operation. No matter the system from which OEM attached with which OEM's frame, they are all plague with noise and fault reading. It is very easy for the OEM and top expert in the investigation to point out the "obvious". But to the people on the floor with all kinds of factor in effect, human factor just bound to happen.