PDP-8L and BA08A : how to connect them ?

Recently, I saved a DEC PDP-8L (S/N 2209) with a BA08A memory expander box (S/N 587) from being trashed. It is is still pretty good shape. However all the flat cables connecting the two boxes have been cut right where they come out of the boxes. There are 8 double flat cables of 11 conductors between the two boxes. The connectors are still plugged in their original location but there is no hope to match the ends which have been cut. I want to reconstruct the connection cables between the main box and the expander. Before starting the soldering work, I need to know how the connections were before (which "Flipchip" connector card in the main box was paired with which connector in the expander box?). So far, I could not find any information or drawing about the BA08A on the Internet. Could someone help me, who owns a complete PDP-8L system (or technical drawing and maintenance guidebooks) ? I am ready to send a list of the number and location of the "Flipchip" cards on the main board in the two boxes as well as the description and location of the cables. Many thanks, Philippe Sonnet