After the latest Manjaro update, I get numerous errors like this when running sbctl verify:
failed to verify file /boot/amd-ucode.img: /boot/amd-ucode.img: invalid pe header
failed to verify file /boot/grub/grub.cfg: /boot/grub/grub.cfg: invalid pe header
Since I use secure boot, I was concerned my system wouldn’t boot and took some precautions, but these errors are spurious and due to a recent bug which made it into the Manjaro release but should already be fixed upstream. My system booted fine even with the errors.
So just do nothing and wait. My kind of bug.