The instruction manuals for the Durst Modular 70 micro light enlarger are available with all other Durst enlarger manuals at the current Durst On-line shop:
I believe this web site online shop is also accessible through the link:
At this on-line shop you can download manuals in .pdf format by using a credit card for payment.
Perhaps another veteran forum member of APUG has an older manual that they can send you for no charge? Good luck.