This follow up report is being submitted to report additional information.The previous repair report for ultra duo fluid system 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 29 october 2018, it was reported by university of iowa that the unit was not displaying fluid levels.Cylinder #1 read 639 and required replacement and #2 spiked from empty to fill and back to empty.Day mechanical systems, inc.Was contacted about the issue and service technician was dispatched to the site.On 29 october 2018, technician confirmed that the unit was not displaying fluid levels.So he replaced level sensor on both cylinders (part#91584) and verified that the unit was functioning as intended and return the unit back to service.The device was tested, inspected, and repaired as per cl ¿ repair cart and evac rev.0.Service work (b)(4) on 29 october 2018.Based on the information, the root cause of the reported issue was due to a malfunctioning level sensor on both cylinders; which means the level sensor was not reading correct fluid levels or display.The reported event was confirmed during inspection of the device and the device was noted to be functioning as intended after the level sensors in both cylinders 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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