The complaint device was returned for evaluation.Incoming visual inspection did not identify any anomalies.Technical visual inspection did not identify any anomalies.Technical visual inspection corner damage on the top case.Device evaluation found that the o2 module had a communication error and the o2 reading was too high.Additionally, the pump was failing the calibration flow check.The pump was replaced.The o2 module was replaced, and the o2 communicating and reading was set at the correct level.The device was calibrated and the tested to oem specification.The fan, fan filter, flow rate, gas calibration and span test, leak check, power on test, and pressure sensor were all checked all passed.The root cause was determined to be that the pump was aged most likely from long run hours.This was related to the previous repair.This type of event will continue to be monitored.
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