The tightening knob from device ro15063 was not available and therefore it was not possible to do an investigation or inspection to confirm the reported issue or determine the root cause for the event on this occasion.Documentation review indicates that the rosa device was manufactured in 2015 and installed in (b)(6) 2016.No issues or non-conformities related to tightening knob the were noted during the manufacturing process.The subject component, the tightening knob was installed in (b)(6) 2016.The event date was (b)(6) 2016.The component had been in use for 11 month.The root cause cannot be established on this occasion.Should the subject device become available in the future the investigation will be re-opened.A replacement part was provided to the customer.
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