Investigation summary: since no samples displaying the condition reported were available for examination, we were unable to fully investigate this incident.Examination of the product involved may provide clarification as to the cause for the reported failure.A device history record review showed no non-conformances associated with this issue during the production of this batch.The defect could not be refuted nor confirmed in the absence of a sample.The root cause cannot be determined for an unconfirmed defect.
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