The letters E and F refer to the patchbay and also the 6 way Bicc connectors on the upper buscard (B, D, E, F, G, K) plus T which is the track remotes and just goes from the buscard to DL's 41 and 42).
I will try to detail the patchbay and DL wiring soon, when I have time but I need to pay bills for the moment so, can't spend the time on this right now, sorry (even though I have started some rough drawings already). I will try to post something soon regarding the patchbay wiring at least.
Night all (posted about 05 am when I should be fast asleep!)