Yeah, that is a very old max. I shucked this drive from an external enclosure, and I suspect that it hit 66º during the brief time I used it as an external drive before shucking it.
As everything else looks good, I'll open up my server and check the cables.
Just to confirm, the procedure to rebuild a drive onto itself goes like this:
stop array
unassign disabled drive
restart array
stop array
reassign previously disabled drive
restart array, and unRAID begins the rebuild
Is that correct?