The replacement Seagate drive arrived earlier today. It appears the RMA process is pretty painless and works very well.
Replacement drive shows up as having the same period of warranty remaining, so all good. The interesting thing to note on the new drive is the label, I’ll take a photo tonight and post it on this entry. Basically the label indicates the drive was reworked.
Now I just need to buy an external case to make use of it, since it was replaced with a Samsung 500GB almost immediately when it died. So no external case available any more to use the Seagate in.