Please excuse my intervention into what is clearly NOT my field, but having spent the last hour or so reading the SI [and comprehending much of it] I find the whole sad saga deeply depressing.
Setting aside the numerous failings, including unreported instrument failures and inadequate checks [excuse my loose terminology] ... has the system now submerged itself in so much convoluted paperwork and 'yuck-speak' that simple common-sense been removed from the equation?
Ignoring numerous other factors, with several cockpit instruments u/s I cannot understand why anyone at ETPS considered the aircraft fit to fly, let alone continue operating it for a week without anyone seemingly bothering to snag it. I wouldn't really want to drive a car in that state.