The united states of america customer reported "the instrument is not dispensing on the first rack and very little on the second." additionally, during repair field service engineer noted "air gap in tubing loop leading into stopcock and syringe." the field service engineer repaired the instrument by replacing the aspiration and dispense check valve which resolved this malfunction.Customer is able to continue testing using alternative instrument.The instrument is fully operational, within specification and ready for the user.Diagnostics were not altered.No direct or indirect patient harm or user harm have been reported.
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