The customer reported that the multi-gas unit was giving low readings.The biomedical engineer had not done the calibration, or dryline receptacle.The biomedical engineer had tried new water traps.This issue was discovered as the device was being checked before starting a case.The device was returned to nihon kohden and evaluated, but the malfunction could not be duplicated.All gases fell within the service manuals specifications.Unit passes air and gas calibration.This unit was tested several times and never had an issue.Nihon kohden will submit a supplemental report in accordance with 21 cfr section 803.56 if additional information becomes available.
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