grub broken in IPFire upgrade from 85 to 87

I believe those are the correct versions. I upgraded the machine and now get a grub error 15. I have no further information except the following:

It is an HVM virtual, running on an LV (should not make a difference)

To troubleshoot, I use kpartx to break it apart. When I mount the /boot partition, I see grub.menu.old, then a grub/ directory. The config file in the grub/ directory has none of the configuration options I expect.

I have made a copy of the image in case anyone wants me to do anything to it. Two other routers have worked just fine with this upgrade, but they are not on an LVM partition?

Anyone has any clues on what I should look for, let me know.

Rod