(b)(4).The subject device was evaluated by a fse on-site.It was reported that the fse upgraded the software and replaced the cpu board of the controller.The system was operational, and all functional checks passed after this visit.As the issue was determined to be related to hardware, a review of the log files was not performed.Review of the device history record found the below which could be related to the reported event: there was a previous corrective maintenance on the same device during which the fse found the cpu board of the controller needed to be replaced.This issue is referenced in (b)(4), the cpu board on the rose one system was malfunctioning so a loaner unit was used in the field until investigation/repair could be completed.(b)(4) is the corrective maintenance on this cpu.Root cause was unable to be determined.If any further information is found which would change or alter any conclusions or information, a supplemental will be filed accordingly.Zimmer biomet will continue to monitor for trends.
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