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P800 Array controller going bad?

Had two drives in the same array fail in a Raid 6 (ADG) setup.  Swapped the drive, it rebuilt and now it says it's predicted to fail soon. Replaced the second drive, and same thing, predicted to fail soon.  What steps can i take to check the controller itself?  I've also seen about the possibility of a backplane problem, how do i check that?  Any suggestions would be very helpful.
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Philip Elder
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What do HP's InSight utilities say in the logs?

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Predictive failure is the S.M.A.R.T data on the drive telling the controller that the drive is out of spec so it can't be anything caused by the controller or the backplane. What drives are they and what firmware are they at? The ACU (or ADU) will give you that info.
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Model#  DF0450B8054, fimware HPD6
ADU Report is attached.
HPD6 is current FW
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