Additional information: d9 - product return.Investigation: until this time, no product was returned.Therefore, an investigation of the product is not possible.Batch history review: a lot number was not available.Explanation, rationale, conclusion and root cause: unfortunately, without the product we cannot determine the exact cause.According to the quality standard and dhr files, a material defect and a production error can most likely be excluded.Conclusion of statistical analysis: root cause cannot be finally concluded.Therefore the root cause specific risk cannot be identified.The potential risk determined during initial vigilance evaluation remains valid.
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