Hi, would you be willing to share your linuxcnc config files?
I have a Cincinatti Milacron Sabre 750 with similar drives but the heidenhain control and powered it up for the first time & the hard disk has just failed with no backups.
I believe replacement drives are NLA, so it might be as well just just bite the bullet and go straight to a retrofit with linuxcnc.
I have done a linuxcnc retrofit before and have spare mesa boards, so would be using a similar mesa hardware as yourself, and any configurations would potentially be very helpful.