Rather than talk about what has happened let me predict Boeings next move.
They will pressure their own engineers to apply a temporary fix to what is possibly a write off.
They will then fly it unpressurised somewhere very quiet and re build it in a secure hangar using all resources regardless of cost.
The FAA will not ground it again and the spin machine will distract us with more
PR while engineering goes round the world applying yet another fix to customer aircraft.
All will be well until the next fire happens.