Try Dave of PI Audio Group. If i am remembering correctly, he may have known them and possibly knows how to contact them. If so, maybe they will be willing to help you get your machine back to their spec.
Mach2Music modified Mac Mini
A couple years back, I purchased a Mach2Music music server from this company. It has been a great performer and has been every bit as advertised. Yesterday the hard drive in the unit crashed. Mach2Music is now out of business so I'm not sure how to fix it with any possibility of retaining the mod's that this company installed. Has anyone been able to contact these guys??