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In the first two pictures you can see the left and right rear of the support channel.  This channel supports the transponder tray, IO expander and OV/LV unit. It now also supports the vent scat tubes and all the wiring for its supported devices.  These wires and the wing wiring, all run in a bundle along the rear of this channel and continue on to the main loop on the port side, routing in the direction needed.