Method: failure analysis, device history evaluation.Results: failure analysis - complaint is unconfirmed; this is due to the product not being returned for review.Device history evaluation - nonconforming product report / nonconforming material report history: none.Variance authorization / deviation history: none.Engineering change order / manufacturing change order history: none.Corrective action preventive action history: none.Health hazard evaluation history: none.Conclusion: root cause cannot be determined due to the lack of information received to perform a complete investigation.Product has not been returned for evaluation.
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