SS, firstly you are correct, I meant Special Bulletins. However, let me phrase it another way (I really don't want to get into a slanging match, this is merely a differing view).
If there had been a catastrophic technical failure one would have thought that the broadest aspects of such a failure might have been identified by now and many would be expecting to hear about various ADs, SBs etc. We haven't seen any of these yet which leads to the presumption that there either wasn't a catastrophic failure or it hasn't been found yet. Considering the high profile nature of this particular aircraft type (Police, ambulance etc), it isn't unreasonable to think that that things such as gearboxes would have been stripped by now. If we are sat here in another week with the same level of information then there are obviously some difficult aspects for the AAIB to get their heads around.
Maybe we are all guilty of jumping the gun.
PS. I flew with Swampy in '91.