Device evaluation: the device was returned for investigation.Visual inspection and functional tests were performed.The customer reported problem was not related to any previous repair.Visual inspection of the device found the tamper seal missing.There was no evidence of the error found in the event history log.The customer reported problem failed calibration was not verified.Performed downstream and upstream fictional test, and the investigation found that both sensors functioned as intended.However, due to the high alarm found in the event history log, it was recommended replacing the downstream occlusion sensor as preventative measure.No fault was found with the device based on the reported problem.The root cause of the reported problem was unknown.Product is beyond a year from manufacture date and there was no indication of a manufacturing defect during the investigation, so a device history record review was not performed.Service history review identified this device has not been in for service previously., corrected data: correction: d4: model number: 2120.Correction: d4: catalog number: 21-2120-0104-01.
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