Again port 0 gone. Slowly but steadily getting to the stage of replacing the disk.

3w-9xxx: scsi4: AEN: WARNING (0x04:0x0023): Sector repair completed:port=0, LBA=0x39206300.
3w-9xxx: scsi4: AEN: WARNING (0x04:0x0023): Sector repair completed:port=0, LBA=0x39206316.
3w-9xxx: scsi4: AEN: ERROR (0x04:0x0009): Drive timeout detected:port=0.
3w-9xxx: scsi4: AEN: ERROR (0x04:0x0002): Degraded unit:unit=0, port=0.
sd 4:0:0:0: WARNING: (0x06:0x002C): Command (0x28) timed out, resetting card.
3w-9xxx: scsi4: AEN: INFO (0x04:0x005E): Cache synchronized after power fail:unit=0.
3w-9xxx: scsi4: AEN: INFO (0x04:0x000B): Rebuild started:unit=0.
3w-9xxx: scsi4: AEN: INFO (0x04:0x0005): Rebuild completed:unit=0.