This report is being submitted as follow up no.1 to update section h3, and to provide the completed investigation results.The actual sample was received for evaluation.Visual inspection of the actual sample revealed that the yellow cap connected to the air vent port had been fractured at the root, and a part of it had been connected inside the port.No fractured piece of the yellow cap was returned.Magnifying inspection of the side of actual air vent port did not find any anomaly including a crack.Magnifying and electron microscopic inspections of the fractured surface revealed: the air vent port was slightly deformed.The fractured surface of yellow cap was partially elongated.Simulation test: since the actual air vent port was slightly deformed, it was inferred that the yellow cap was strongly fitted due to some force.Therefore, the yellow cap was attached to a factory-retained product and applied shock force on it.As a result, the yellow cap was tightly fitted and was fractured (twisted off) at the root when removed.The fractured surface of yellow cap was partially elongated.Based on the provided information and investigation results, there is no definitive evidence that this event was related to a device defect or malfunction.It was likely that some force was applied to the yellow cap of air vent port, and the yellow cap was tightly fitted.However, since the fractured piece of yellow cap was not returned and could not be inspected, it was not possible to clarify when the force was applied.The exact cause of the reported event cannot be definitively determined based on the available information.
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