@gungasnake,
Sorry but at best all they could state as a fact is they had not been able to find/reproduce the problem.
It surely does not mean that somewhere in that 280,000 lines of code interacting with the real universe environment there is not a problem that could cause a one in a few millions runaway event.
NASA did not update the 1980s computers/software for the shuttle flight control system because of the danger that no matter how careful you are you could still end up with a bad bug in any new flight control system.
Oh NASA is also the folks who cheerfully destroy a billion dollars plus Mars space probe as part of it software was working in the MKS system and the other part was in the good old fashion English feet/slugs/second system.