How to troubleshoot cache drive errors?

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I am starting to see errors on my cache drive pool (sample attached) cachedriveerrors.txt

I suspect that one of the drives in the pool is starting to fail , but when i try to run smart tests on the drive nothing seems to happen (no feedback after the button click) 


The btrfs dev stats are not showing any errors:

root@TheBeast:~# btrfs dev stats /mnt/cache
[/dev/nvme0n1p1].write_io_errs    0
[/dev/nvme0n1p1].read_io_errs     0
[/dev/nvme0n1p1].flush_io_errs    0
[/dev/nvme0n1p1].corruption_errs  0
[/dev/nvme0n1p1].generation_errs  0
[/dev/nvme1n1p1].write_io_errs    0
[/dev/nvme1n1p1].read_io_errs     0
[/dev/nvme1n1p1].flush_io_errs    0
[/dev/nvme1n1p1].corruption_errs  0
[/dev/nvme1n1p1].generation_errs  0


I  also attached the smart log that the system does have Samsung_SSD_960_EVO_250GB_S3ESNX0J930294R-20190524-1033.txt



Can anyone recommend how to troubleshoot this? 

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