Following the s5 service manual (cp_sem_48-x0-00, revision 02), the field service technician replaced the hms and the hmf boards.Replacement of the boards solved the reported issue.Technical safety check was successfully performed after the replacement and the unit was put back in service.A review of the dhr could not identify any deviations or nonconformities relevant to the issue.Based on all the above facts, it cannot be ruled out that the reported malfunction was due to a defective motor controller board and motor power amplifier board.
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