The dispatched fse was unable to download logs from the machine.After replacement of the main board the device passed all tests and could be returned to use.The main board was evaluated by the manufacturer.Visual inspection revealed several mechanical damages like broken ferrites and cable connectors.It is however seen likely that these damages were caused by e.G.Dropping the board to the floor after de-installation and that the actual condition has no relation to the reported event.The failure to retrieve logs can be confirmed, a memory error is the most likely root cause since all other functions work according to specifications.Dräger is not aware of any memory failures which occurred under the conditions of the intended use.There are individual complaints known where memory errors came up after the machine had been exposed to x-rays.For the particular case it could not be determined if this explanation applies here as well.The reported negative pressure alarm was most likely related to the procedure or to patient condition.For example, a fresh gas deficit in combination with spontaneous breathing efforts of the patient may cause such effect or the use of a bronchial suction system.Without the possibility to evaluate the log file is no reliable conclusion possible but there was no indication that a technical error condition may have caused this - the unit passed all functional tests.The additionally observed deviation in the delivered tidal volumes was related to an improper repair - a component with a wrong hardware revision state was used to correct another issue about one year ago.All issues of the machine have been corrected by the main board replacement.
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