Device evaluated by manufacturer, evaluation and conclusion codes device evaluation: one unit was returned for investigation.Upon visual inspection the device appeared in good condition.Functional testing was performed and all alarms were triggered but there was no sound coming from the device, confirming the customer complaint.A faulty speaker on the printed circuit board (pcb) was found to be the cause of the issue.A manufacturing device history report (dhr) review was not performed because the device is beyond a year from its manufacture date and there was no indication of a manufacturing defect during the investigation.Service history review identified this device has not been in for service previously.The pcb, reservoir gasket, and the o-rings were replaced; functional testing and preventative maintenance re-ran.Device passed all tests.
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