Route the shielded twisted pair cable under the terminals 39, 34, 29 and 24, back around
the outside of the plate choke and over to the black RCA jack, nearest the corner of the chassis.

Attach and solder the black wire of the free end to the ground solder tab of the black RCA jack.
Insert the end of the red wire inot the solder cup in the center pin of the black RCA jack and solder.