(b)(4).The field service representative (fsr) went on-site to evaluate the suspect device.The fsr determined the most likely cause of the reported event is the main printed circuit board assembly (pcba).After replacing the main pcba, the issue was resolved.The fsr performed the user verification test and operational verification procedure, according to manufacturer specifications.The customer reported the main pcba has been disposed of, therefore no further evaluation can be performed at this time.
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