Looking for Documentation on Tektronix Training Board 3 (aka TB3)

[calibrationfixture]

Hi,

Contrary to the Training Board 2, for which an Instruction Manual (071-1137-00, 26 pages) can be downloaded, Documentation on this Board is scarce as hen's teeth. I contacted Tektronix about it and they could only find a 1 Page Document (see below). A picture of this TB3 is on page 152 of the very informative Application Note 48W-26279-3: MSO5000/DPO5000 Series Lab Excercise Book (2012). Anybody having more then these slivers/crumbs?

Calibrationfixture