"If there was a defect that got past an area/department and to the customer, this is unacceptable and should be counter-measured temporary (stop the bleeding) to ensure nothing else 'flows out' as well as finding the permanent countermeasure (using PDCA) (again this is all initiated by the plant manager--they should be responsible at this level and gather the resources necessary, and involving their people to ensure this will not happen again and learn from it for the the next A3)."
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