(b)(4).Asp investigation summary: the investigation included a review of the device history record (dhr), service history, trending of the product malfunction code, 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 for the past six months (03/28/2015 to 09/24/2015) did not observe any significant trend.The trend for the product malfunction code of haze/mist/vapor was completed from (b)(6) 2014 through (b)(6) 2015 and did not reveal a significant trend.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." no parts were returned for further evaluation.The assignable cause of the haze/mist/vapor issue is the vacuum pump oil.The field service engineer replaced this part 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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