Ok, so that’s one 8TB drive installed (replacing a…

Ok, so that's one 8TB drive installed (replacing a mysteriously missing drive) and the resilvering process has gathered it into the pool's fold. That just leaves:
– A DEGRADED 8TB drive
– A FAULTED 3TB drive
– A DEGRADED 3TB drive
But first I need to tune the system fans based on live drive temperature readings, because if I don't get them under control I'm going to end up with permanent hearing loss!