Hi @reverendalc ,
According to this image taken from the [https://download.lenovo.com/pccbbs/mobiles_pdf/p40_yoga14_mt20fy_yoga460_hmm_en_sp40j47499_01.pdf|service manual] for your laptop, the connector that you are referring to, is the OneLink+ dock connector. Is this the one that you mean?
If it is the one, then it shows that it is mounted directly onto the systemboard and is not on a separate board.
[image|1530220]
(click on image to enlarge for better viewing)