This event has been recorded by zimmer biomet under (b)(4).The previous repair report for ultra duo flex fluid cart serial number (b)(4) was reviewed and noted no related non-conformances, requests for deviation (rfd) or any other issues with the repair.The previous repair report review found no issues with the device after repair and all verifications, inspections and tests were successfully completed.On (b)(6) 2018, it was reported from (b)(6) medical center that a cart was always reading full with nothing in the cylinders.On (b)(6) 2018, (b)(6) was contacted about the cart, but was not available until (b)(6) 2018 for service.On (b)(6) 2018, the account attempted to troubleshoot further and resolve the issue themselves.It was reported the account replaced the level sensor, tested the cart, verified that the unit was functioning as intended, then returned the unit to service without further incident.Service work order (b)(4) on (b)(4) 2018.The reported event was not confirmed due to no zimmer biomet service technician being sent to the site; therefore, the root cause could not be determined.The account claimed that changing the level sensor resolved the reported issue of the cart reading full with nothing in the cylinders.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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