Result of investigation: a vyaire field service representative (fsr) went onsite and evaluated the ventilator.It was seen that it was seen that the ventilator won't pressurize, upper cooling fan not rotating, displays are off or erratic operation and measured power supply voltages missing.Fsr replaced power supply but it did not resolve issue.Noticed that when the alarm board was disconnected the voltages were back.Fsr replaced the alarm board and the ventilator run as intended.Performed the 7 year preventive maintenance that was due, replaced power driver module, checked power supply, calibrated pressure transducer and ddi board, checked out alarm function and pneumatics, calibrated driver controller and run final test.All tested ok according to factory specifications.Vyaire medical will submit a supplemental report in accordance with 21 cfr section 803.56 if additional information becomes available.
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