This supplemental report is being submitted to provide the lm investigation.The legal manufacturer (lm) reviewed the content of this complaint for further investigation.The lm reports that the root cause could not be identified.The legal manufacturer provided the following possible cause for the reported event are presumed as follows: two pressure measurement rods lighted up at the same time.The cause of the indicated phenomenon is that the main board has failed.The cause of the failure of the main board could not be identified.It is a guess, but since it has been 13 years since it was manufactured, it is thought that it is due to deterioration over time.As a result of checking the dhr, it was confirmed that there were no manufacturing abnormalities, special hires, or variations.
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