The subject device was inspected at (b)(4) but it could not duplicate the reported phenomenon.Omsc reviewed the manufacturing history (dhr) of the subject device and confirmed no irregularity.The root cause of the reported phenomenon could not be identified.[considerations] from the following facts, the cause of the reported phenomenon could not be identified.In addition, there was no abnormality in the inspection, and detailed information on the occurrence situation could not be obtained, so the cause could not be estimated.Facts confirmed from the investigation.It was confirmed as repair and inspection at (b)(4) that there was no abnormality in the subject device.It could not get detailed information about the occurrences.If additional information is received, this report will be supplemented.
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