(b)(4).The previous work order in customer relationship management (crm) 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 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 4 times, the previous repair being for clog removal on 11 may 2017.The clog removal 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) center that the unit had two bad level sensors.On (b)(4) 2019, a zimmer biomet authorized repair technician was at the site, and directed to the unit.The technician found that the level sensors were bad on the unit, as the a/d values were inaccurate while in service mode.The technician replaced the level sensors (part #91584 and lot #0040109) for each cylinder 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.While the service technician confirmed the reported event pf bad level sensors and the device was noted to be functioning as intended after the level sensors replaced, it is unknown with the information provided why the level sensors were reading the incorrect fluid levels.Therefore, based on the information provided, a specific root cause of the reported event cannot be determined.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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