Owners Manual- available for download here:
http://www.peaveyt60.com/images/Peavey T-60.pdf
Wiring diagram -
http://www.peaveyt60.com/mods&hotrodding.htm
Custom work- Chip Todd (T-40 creator) does custom work on T series instruments and others, including lightening bodies, custom tops, body binding and left handed instruments.
http://www.peaveyt60.com/ctecustoms.htm
Promotional materials- All the T-60 materiel here are also features the T-40.
http://www.peaveyt60.com/t-60_brochures.htm
Websites:
http://www.peaveyt60.com/t-60_articles.htm has schematics (same as t-60) info about T-40 creator Chip Todd, and early Peavey instruments, and some informative articles. Also, check the Peavey website for owners manual and related information on their forums. Chip Todd is known to post on the T-60 and official Peavey forums.
http://peaveyt40.forumotion.com/index.htm
Not a super active forum, but a great place to get information about the T-40.