I'm going to do a bit of speculating of my own on this.
Could it possibly be that no changes have been brought about because it is not yet known exactly what changes need to be brought about, what the cause of the accident was, what caused the fuel leak, why there was a bomb bay fire. Could it be that they are themselves awaiting the findings of the BOI before it could be possible to effect any change. Afterall to change something you have to know exactly what needs to be done.
All comes back to having the actual facts.
There is a huge difference between "i think" or "I guess" this is what happened and "I know". The one you listen to is the one who knows.