Investigation: a detailed failure analysis could not take place.The hose burst centrally.Functionally, the motor, the air plug as well as the hose are in order.A mechanical damage can be found on the burst hose.The bruise most likely caused the burst of the aire hose.A correct circulation of the exhaust air was not possible.Batch history review: the device history files for the material has been checked and found to be according to the specification valid at the time of production.There is no indication of a manufacturing failure.Conclusion and root cause: the mentioned failure is most probably user related.No capa is necessary.
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