That's a toughie since Simpson didn't exactly flood the market with scopes.
If someone here doesn't happen to have a manual they can copy, here's some
sources you can check out who deal primarily in test equipment manuals:
www.agtannenbaum.com
www.manualsplus.com
www.w7fg.com/manuals.txt
Ed Matsuda
POB 390613
San Diego CA 92149
619-479-0225 (voice)
619-479-1670 (fax)
Another couple of sites that might be helpful:
www.repairfaq.org/repair/f_manuals.html
http://gama.inesc.pt/public/info/repair/f_manuals.html
http://bama.sbc.edu
And I've heard about, but haven't checked out myself this site:
www.ac6v.com/pageaae.html
Best of luck,
Dean