On (b)(6) 2015 a field service engineer (fse) was dispatched.When the fse did a valve test it was noticed that one of the valves was slightly open.By using the supplied service cd, the fse replaced the inlet check valve with a new one and then performed a valve test, showing that it is now working as it should.The fse also ran 10 samples, all of which passed with no errors.The customer then ran qc which passed well in the lab's qc range.The g8 analyzer was functioning as intended and the error cleared.No further action required by field service.The probable cause of the event was a bad inlet check valve.A complaint history review for serial number (b)(4) was conducted from 30-nov-2014 through 30-dec-2015 for similar complaints.There was one (1) similar complaint identified during the search period.(b)(4).This report is being submitted due to a retrospective review conducted under capa (b)(4).
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