(b)(4).The previous work order in customer relationship management (crm) for ultra duo flex fluid cart serial number (b)(4) (dms-27886-msfvlk) was reviewed and noted no related non-conformances, requests for deviation (rfd) or any other issues with the repair.The previous work order noted no issues with the device after repair and all verifications, inspections and tests were successfully completed.Using crm to query for serial number (b)(4), the device was noted to have been previously repaired 1 time, the previous repair being for reported evac comm errors on 2 february 2016.The reported event is not associated with the current repair.Thus, this repair was a non-related issue.On (b)(6) 2019, it was reported from (b)(6) that the cart was showing cylinders were full even though they were empty.On (b)(6) 2019, a zimmer biomet authorized repair technician was contacted about the cart and dispatched to be at the site.On (b)(6) 2019, the technician arrived at the site and confirmed that the cylinder was reading the incorrect fluid levels.The technician replaced the level sensors in both cylinders (part #91584 and lot #0040109) 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.The root cause for the reported event of unit reporting that the cylinders were full when empty was due to defective level sensors.The level sensor reports the volume in the cylinder, and if it is defective it will not report a correct output, which can make the cylinders appear to be full when empty.The reported event was confirmed during inspection of the device and the device was noted to be functioning as intended after the 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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