B3.Date of event: unknown.No information has been provided to date.D5.Other operator of device: operator of device is unknown.E1.Initial reporter phone#: (b)(6).Investigation summary: the affected device was returned for evaluation.Visual inspection was performed, and the device was found to be in good condition, with no visible cracks or damages.Functional testing was performed, and the unit worked as expected with normal pump-running noises.The device passed the electrical and safety testing.The customer's indicated failure could not be duplicated or confirmed, and no root cause was identified.A review of the device history record (dhr) shows there were no observations or nonconformities recorded during manufacture to suggest an issue of this nature would occur with this lot of products.
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