In my experience, AH might well be chasing the diagnosis of this matter as a matter of quite some urgency, but just not saying so to external or uninvolved sources. Test facilities and specialists may have to be sought and that all takes time. Tests themselves take time to devise and test, then there is the analysis and any rework required....It is not the first time they (AH) have worked quietly in the background. Their
PR decisions may be quite different to expectations of publicised openness. Sometimes the less said, the better.
Having said that, the agreement of EASA to a theroretical 'risk management' approach is, I think, diabolical. The UK and Norwegian authorities have the right approach.