(b)(4).Investigation - evaluation: a review of the complaint history, functional test, drawings, device history record, manufacturing instructions, trends and quality control of the returned device was conducted during the investigation.The visual inspection of the returned device reported one used 1ptws-ra-r stopcock was returned for investigation.Stopcock showed no signs of defects.It was liquid tested and passed.It easily opened and closed.The customer stated two stopcocks leaked.Only one of the two was returned for investigation.The stopcock that was not returned will be confirmed for leaking.The complaint device was returned therefore, an investigation evaluation was performed.There is no evidence to suggest the product was not made to specifications.Review of device history record shows no nonconforming events which could contribute to this failure mode.It should be noted there were no other reported complaints for this lot number.Based on the information provided, and the results of our investigation, a definitive root cause could not be determined.We will continue to monitor for similar complaints.Per the quality engineering risk assessment no further action is required.
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