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H3: the affected extension was not returned and therefore analysis was unable to be performed.As no samples nor pictures were provided by the customer, a visual inspection was unable to be performed.The device history record was reviewed, and it was confirmed that no non-conformities were reported during production.The quality inspection forms were reviewed, and it was observed that no defects were found, and the lot was released.Without the return of the used samples, a comprehensive failure investigation cannot be performed, and a probable cause cannot be determined.
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