(b)(4).A carefusion fsr evaluated the unit and observed the following: what the customer was actually seeing was that expiratory would not return to baseline.He observed that the expiratory pressure xdcr zero had drifted 200 a/d counts.The expiratory pressure xdcr had failed.He determined the root cause of this issue was a faulty gas delivery engine.The service rep replaced the gas delivery engine and reset the serial number and model configuration.He performed operational checks, and found that the unit was operating per mfr specifications.The repaired unit was returned to the customer.A returned goods authorization (rga) number was issued for the return of the faulty gas delivery engine.The faulty gas delivery engine was returned to carefusion failure analysis lab for evaluation on (b)(6) 2015, however it has not been evaluated.Once the faulty gas delivery engine is evaluated, a f/u medwatch report will be submitted.
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