Root cause: potential alteration of staining in this case was due to improper operation of the dispense check valve (3 psi one way valve).The problem was solved by field service engineer with replacement of the part.Following the replacement, the instrument was fully operational within specifications, without errors and available for the user.Failure mode description: following a dispense check valve malfunction or if the part stops working; the resulting failure mode could occur.Small leak could result in drops of buffer from the probe after wash or dispensing aberration resulting in low volume dispensed (first dispense).This failure mode has the potential to alter staining.
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