Investigation results: an investigation is not possible because the device was not available for investigation.The device history records have been checked for the available lot number and found to be according to the specification valid at the time of production.No further complaints registered against the same lot number.After a review of the device history records, there is no indication for a manufacturing error.According to our database, the device was delivered in september 2012.A maintenance / repair was not registered since that date.In the instructions for use it is advised that a maintenance should take place at least once per year and based on the corresponding lase engraving.Abstract of the ifu (ta011474 - 12/09): " to ensure reliable operation, maintenance has to be carried out as indicated on the maintenance sticker [.]".In summary, the error is probably due to wear and tear.
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