(b)(4).Asp investigation summary: the investigation included a review of the device history record (dhr), service history, failure mode and effects analysis (fmea), and system risk analysis (sra).The dhr was reviewed.The unit met manufacturing specifications at the time of release and there were no issues related to this failure mode noted.The service history for this unit was reviewed for the past 6 months (06/07/2015 to 12/04/2015) and trending was not exceeded.The fmea revealed the risk priority number (rpn) scores are considered to be acceptable.The sra shows the risk for exposure to toxic or corrosive material to be "low." the catalytic converter and pm level 1 kit was not returned for functional evaluation.The assignable cause of the odor/smells issue is the catalytic converter and pm level 1 kit.The field service engineer replaced these parts and confirmed the sterrad® nx was restored to proper function after service.The reported issue was resolved at the customer facility.The issue will be tracked and trended.
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