Read errors on disks 10 and 12 appear to be resolved, at least for now, you need to check filesystem on the emulated disk3:
https://wiki.unraid.net/Check_Disk_Filesystems#Checking_and_fixing_drives_in_the_webGui
Remove -n or nothing will be done and if it asks for -L use it.
If after that emulated disk3 mounts check that contents look correct, also look for lost+found folder for any partial or lost files, if all looks good next step is to rebuild the disk, old disk3 looks fine and problem was most likely cable related, but if possible I would recommend rebuilding to a new disk just in case something goes wrong during the rebuild, with the new cables there were no errors on boot, but there could still be during the rebuild, which is much more i/o intensive.