The field service engineer (fse) found condensation and bubbles on the electrodes.The bubbles were removed from the electrodes.Afterward, the fse performed daily maintenance, ran qc, and performed repeatability testing.The na electrode lot number was 21512762 with an install-by date of 04-mar-2022.This electrode was installed on the instrument on 16-nov-2021.The electrode was valid for use until 02-aug-2022.The event occurred on 30-jun-2022.The na electrode was valid at the time of the event.The k electrode lot number was 21513747 with an install-by date of 01-apr-2022.This electrode was installed on the instrument on 16-nov-2021.The electrode was valid for use until 17-may-2022.The event occurred on 30-jun-2022.As such, the k electrode was invalid at the time of the event.The customer used sample tubes with a gel separator.Serum-separated tubes can contain spray-coated silica.Product labeling states: "do not use sampling containers containing silicone." the sample tube used could affect the na results.Calibration and qc were acceptable.The investigation did not identify a product problem.The cause of the event could not be determined.
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