DBabk, Thank you for posting in the Intel® Communities Support.
In reference to your question, in order to confirm which is the drive that is showing problems, first, we need to take the drives out of the RAID configuration, to do that please set both drives to "Non-RAID Disk" and then run the diagnostics tool:
https://downloadcenter.intel.com/download/28593/Intel-Solid-State-Drive-Toolbox
Regards,
Alberto R.
Intel Customer Support Technician
Under Contract to Intel Corporation
