(b)(4).Physio-control evaluated the customer¿s device and verified the reported issue.Physio-control replaced the user interface pcb assembly.After other unrelated repairs were completed, proper device operation was observed through functional and performance testing and the device was returned to the customer for use.Physio-control further evaluated the removed user interface pcb assembly.It was determined that the memory of integrated circuit chip, designator u2 had become corrupt and caused the reported issue.
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