ReadyNAS Ultra 4 Volume Failure after replace 2 dead disk

Really need some help here, all my kids pictures since they were born are on it...

2 (disk 1 and 2) out of the 4 disk has been marked as dead for a while, and I have been using the NAS with 2 out of 4 was dead w/o issue.

Decided to replace the 2 dead disk, replaced disk 1 and the sync/rebuilt took days. Then replaced disk 2 it was almost immediately done. However when I checked the admin GUI it shows the whole volume dead with 0Mb usage, and the 2 new disks were marked as spare.

However the front panel still shows 3T out of 7T is used. From windows explorer I can navigate onto the NAS and see some directories etc (although very slow), however when I try to copy a file it says network error.

I have screen shots capture here:

and the log from the admin GUI here:

also downloaded all the log from the admin GUI here in a zip file:

I'm scared to even reboot the NAS now. I want to try to remove the 2 new drive that in swapped in, would it somehow return it to a useable state so I can make backup and restart from scratch? But I'm not dare to try it for it might corrupt it more? Kinda crazy it was working fine with 2 good 2 dead disks and replacing the 2 dead disks got me into this state...

Please help...