(b)(4).The dhr for the instruments in question, was reviewed and found completely without any irregularities.This instrument was manufactured at the (b)(4) facility as part of a (b)(4) lot in december of 2013.The returned instrument was evaluated and found that the knob rotation is slightly sluggish and the knob and back plug are discolored and faded.Further evaluation showed that this instrument picks up, retains, closes and releases clips as required of its function both with and without the use of silastic testtubing thus we are unable to validate the alleged complaint.Parts were 100% visually inspected and tested at the (b)(4) facility before instruments were sent to customer.No irregularities were found and or reported at the time of inspection and assembly of the product, as this is a standardized process for all instruments manufactured at this facility.At this time it is un-determined what caused the alleged issue.No corrective action required at this time.Other remarks: confirmed, but the root cause is unknown.
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