You probably have systemd-boot installed so there should be no need to repair or install grub.
To check try this: (quoted from @dalto)
What does pacman -Q | grep -E "grub|dracut" return?
If you are using grub, you will have both grub and eos-dracut on the list.
If you are using systemd-boot, you will have kernel-install-for-dracut on the list.
Keep in mind, everyone has systemd installed because it is used for more than just booting.
Why do you think grub needs repairing? What did you try to achieve? Add kernel parameter to boot process?