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This report is being supplemented to provide additional information based on the approved final investigation.New information added to the following fields: d8, d10, and h6.The device history record was unable to be reviewed for this device since the serial number was not provided.However, olympus only releases products to market that meet all manufacturing specifications and final product release criteria.Based on the results of the investigation, although the root cause was unable to be specified, it is likely the event occurred because the replacement period of the water filter was overdue (replaced once half a year).It is considered that the user did not thoroughly read the instruction manual and the mismanaged the method of the water filter replacement, leading to the subject event.Disinfection of the water supply piping had not been implemented due to the user not thoroughly reading the instruction manual and having a lack of knowledge of the device.The event can be detected and prevented by following the instructions for use which state: "instructions for oer-4 operation manual: chapter 7 ¿routine maintenance¿ section 7.2 ¿replacing the water filter (maj-2318)¿ replace the water filter periodically, at least once a month to prevent contamination of the rinse water.The water filter should also be replaced whenever the error code [e01] indicating water supply insufficiency is displayed.Instructions for oer-4 installation manual: chapter 4 ¿installation of equipment¿ section 4.18 ¿checking the functions¿ warning: perform disinfecting the water supply piping in the following cases.- before using this equipment for the first time (after installation of the water filter).- immediately after replacement of the water filter.- whenever bacteria in the water supply piping is identified.- before using the equipment when it has not been used for a long time.Use the acecide disinfectant solution in the equipment for disinfection of the water supply piping." olympus will continue to monitor field performance for this device.
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