Well, if it happened twice in 50,000 hours, and Boeing haven't identified (as I understand it) what the cause was, but only have palliatives, it will happen pretty soon again. Hopefully fully contained inside the strongbox.
What are the FAA going to do then ?
We did notice that the FAA approval to start a test plan was presented by Boeing's
PR in a cleverly-worded press release which would imply, unless you read the words carefully, that the aircraft itself had been given the all clear.