Problem with many "engineers" nowadays is that they have forgotten how a system functions and only go by FIM or TSM. Quite damning that nobody appeared to question why the ailerons were functioning in the incorrect "sense"!!!
Have people forgotten the reason duplicate inspections used to exist precisely for Flying controls , landing gear and emergency/back up systems.Very lucky the crew managed to "steer" the aircraft away from Lisbon, dread to think what could have happened had it gone down in the city.