READYNAS-PRO-6 Replaced Failing disks Not Rebuilding

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Another thing you could try is to power down the NAS, and install the original drives in their original slots.  Then power up the NAS, and see if the volume can be mounted.  The challenge here is that the more things you try, the more difficult data recovery becomes.

 I was thinking this maybe an option and will try.  I'll let you know how it goes.

Just to be clear, I swapped the first disk and it went to a spare after say for a day or so that recovery was 6% and was not moving.  On the third day the NAS advised me that drive 3 was failing and needed to be replaced, so I did, it immediately went to spare no recovery was started.  At some point within a few hours, drive 6 started showing up as a spare?  Drive 6 log on the web-interface showed it wanted to be replaced as it was failing as well. 

I work in a data centre, in my entire life I have never seen a three-drive failure, never ever. The two disk failures are rare but have had some over a year and very common is one disk failure on any raid.  I believe there is more at play here.  Having said that, for the last 5 days it all stable with the layout in the photos, but cannot access the data and drives sitting on spare.  

I'll let you know how replacing the drives go.  Thank you for your assistance