Root cause . AOA sensor issue . So what is that ? . Wiring issue ; probe issue ; probe mounting issue ; sensor issue , analyser issue / damage ; rogue components ; position of analyser mounting . Alignment fixing issue , mount damage ; and the list goes on
What constitutes a replacement ? . A complete assembly or part of ? .
Whatever - the problem was not solved ; put a trouble shooter on board - to do what ? . Maintenance from previous flight targeted problem , trouble shoot by " the book " still a concern . Then we have the flight managment control issues , just as an addition . .. ohh hell .