The reporter's product was requested for investigation.The retention material of lot 41567701 was visually checked.The retention material shows no abnormalities.One vial of test strips was returned for investigation.The label on the test strip vial is missing.Technical documentation, logbook, and production documentation were checked and there were no entries which could imply the root cause of this error pattern.An unknown technical failure occurring during manufacturing is the root cause of the defective vial.
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