Initrd in grub not created automatically in RHEL 7.1

I have inherited support responsibilities for a RHEL 7.1 server which is unable to boot into kernel 3.10.0-229.el7.x86_64. I can manually edit grub menu and add in the line initrd /initramfs-3.10.0-229.el7.x86_64.img and it boots fine - but this is not persistent so I need to figure out why this line is not being added automatically.

I have tried manually reinstalling the kernel via yum, no change in results.
I have run dracut --force, with no change in results.

This is a backup server, and the client is understandably concerned about this server loading automatically if it ever powers off.

Help?