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The suspect pump was returned for evaluation.The event history log (ehl) was reviewed, and a "cassette not attached properly" alarm was identified.A review of the 12-month service history was conducted, and no relevant findings were identified.Visual inspection and functional testing were performed.The customer-reported issue was confirmed through pci functional testing.During testing, the pump generated error code 46440, which was related to the dso sensor.The probable cause of the reported issue was determined to be a defective dso sensor.The dso sensor and dso seal were replaced.Upon further investigation, the pwa board connector was found to be damaged.The pwa board was replaced.Dso/uso sensor calibration was performed, and the software was reloaded and updated to the latest revision.The device passed all functional and delivery tests following completion of the repair activities.
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