What is really happening here (if you are interested in the truth)
Airbus and Northrop Grumman have been sued in State Court in Chicago, Illinois by 175 pax and crew. The case was first filed over 18 months ago.
Access to Courts is much easier and cheaper in the US than Australia or the UK. Don't believe the garbage on here to the contrary by armchair lawyers.
The liability theories centre around the defective ADIRU, its software programming, and its effect on the flight control computers.
Damages and compensation is considerably higher in the US than Oz or the UK, because a jury gets to hear the story and to allocate money by way of compensation. The aviation insurers of the manufacturers pick up the bill.
It is accurate that many passengers have resolved their claims. It is also an open question as to whether Airbus and Northrop will not contest liability for the remaining claims. This issue was addressed in open court this month.
If you are still interested, you can sit in at the next status hearing in the Chicago Court.