Date of event: unknown.The date received by manufacturer has been used for this field.Investigation summary: since no samples displaying the condition reported are available for examination, we were unable to fully investigate this incident.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 fourth complaint for the lot# 8261706 for the same defect or symptom.Previous complaints: (b)(4).There was no documentation of issues for the complaint of batch 8261706 during this production run.Root cause description: no root cause can be determined as no samples were received.Rationale: no sample provided.
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