No complaint was received with the return of the device.Failure event observed during analysis.Final analysis found the device was in backup mode.Analysis of device image found the device went into backup mode due to a power on reset (por).After the device was restored from backup mode, functional testing was performed.Telemetry, impedance, sensing, pacing and high voltage (hv) output functions of the device were tested and found to be normal.The backup operation could not be reproduced.The cause of backup mode could not be determined.
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