Hello Vinny,
Yes, that's the expansion card I have in the P4 (PLM-4L, the one with two L ports). So without a Y splitter on L3/L4 of the Expansion Box whatever is connected in that port would be L13, if I understand correctly.
And I agree I need to test with the original cable. In order to do that I need to redo some cabling which I'm not looking forward to! :-)
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