The result of our analysis of this complaint from (b)(6): the probable root causes could be determined as a material failure and design failure.Device history records of the complained lot has been reviewed and no abnormality was found for the related material.Moreover, no scrap record for the related material was found.The crack on the temperature probe could be related with weakness of the material.On the other hand, it could be possible that the operator could tighten the temperature probe regardless of the torque settings.Thus, basic operation procedure related with the torque values should be revised.As a corrective action, for the previous complaints regarding to the same failure, we had opened capa (b)(4) and all actions will be followed by capa (b)(4).Also, our operators have been informed with regard of the complaint.A supplemental medwatch will be submitted if additional information becomes available.
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