My last couple of builds needed RestoreHealth, but it failed. When this has happened, I've never even once got a fix by specifying a source. Only installing a download of the subject build from UUP has worked, but it's hardly worth all that effort since the problem has always gone away on its...
It will hurt me! Because it means I'll have to run sfc, do the dism routine, clean things up and do full backups on 3 system drives. But I'll probably do it anyway. ;-)