(b)(4).Investigation summary: since no samples displaying the condition reported are available for examination, we were unable to fully investigate this incident.No root cause can be determined as no samples were received.Based on no sample, the investigation concluded, bd was not able to verify the indicated failure.A device history record review was completed with zero defects found.No quality notifications were written for this batch, nor for the associated assembly batches.Investigation conclusion: this is the 1st complaint for lot # 8331638 for this type of defect or symptom.There was no documentation for this type of defect during the entire production run of this batch.Based on the investigation carried out and with no sample for analysis the symptom reported by the customer can¿t be confirmed.We will continue monitoring this lot and symptom.Root cause description: root cause could not be offered since sample analysis couldn¿t be performed.Rationale: capa not required at this time.A review of the applicable fmea/eura (peura(b)(4) indicates that the potential risk of the reported event was assessed appropriately in the risk management documentation.
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