Few questions about a raid array with 3 faulty spares

So I just had 3 drives on a raid6 array marked as failed all at the same time.
I think it's unlikely that all of the drives went bad at the same time
so I am thinking the reason could be that one of my sata controllers
died or something like that.

I am thinking about moving the disks to other sata ports and then try
to get the array running again. My question is what method I should
use,
force assemble? Re-add? Or something else?
Would a force assemble be enough to unmark the disks as faulty? If I
try to re-add, would it wipe the data on the drives? I'd rather not
get my drives wiped in the process (for obvious reasons).

And if anyone knows of a way I can furter investigate as of why the
drives just got marked as failed all of a sudden I'd appreciate the
help.