(b)(4).The device history record (dhr) for ultra duofluid cart serial number (b)(4) was reviewed and noted no related non-conformances, requests for deviation (rfd), change notices (cn), or any other issues with manufacturing.The dhr review found no issues with the device and all verifications, inspections, and tests were successfully completed.Using crm to query for serial number (b)(4), the device was noted to have not been previously repaired by zimmer biomet surgical.On (b)(6) 2019, it was reported from (b)(6) hospital that a duo cart unit was showing the cylinder was full when it was empty.On (b)(6) 2019, drmet biomedical llc was contacted about the cart and dispatched a service technician to be at the site.The technician arrived at the site and confirmed that fluid was not registering properly in either cylinder of the unit.The technician replaced both level sensors (part #91584 and lot code #0028645) and then verified that the unit was functioning as intended.The technician then returned the unit to service without further incident.The device was tested, inspected, and repaired as per cl ¿ repair cart rev.4.Service work order dms-51660-w5m3g3 on 07 may 2019.The root cause for the unit showing incorrect fluid levels was due to malfunctioning level sensors in both cylinders.The level sensor reports fluid levels in the unit; malfunctioning level sensors would result in the incorrect fluid readings reported and could also cause errors to be issued.The reported event was confirmed during inspection of the device and the device was noted to be functioning as intended after both level sensors were replaced.The investigation was based on the information that was provided initially and any information that was obtained throughout the follow-up process.
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