This is the second time scanner has reported imminent drive failure on a brand new 6TB Seagate drive. There are no smart errors or surface defects on the drive. The file system is reported as healthy. The whole disk is healthy. All three 6TB drives are healthy.
It could be the controller? Two of the 6TB drives are on the same controller that I recently put in to replace the one with the two dead ports. I can't tell if it's those two drives scanner is reporting as ready to fail. I should probably try to swap out a drive this weekend on the other controller to see if it actually hot swaps out the drive for the new one.