My replacement part fot the DC / Sound board was new, and did not include the RJ-11 connector and cable. From the old part, the RJ-11 port is the gray connector next to the power connector. Grasp the RJ-11 connector, and slide it off of the DC / Sound board (there is no retainer nor clips, friction holds it in place). The RJ-11 connector can then be moved to the new part, just sliding into the square cut-out next to the power connector.
For reassembly, it is much easier to keep the PC cage out, place this cable, and then install the PC cage.
My replacement part fot the DC / Sound board was new, and did not include the RJ-11 connector and cable. From the old part, the RJ-11 port is the gray connector next to the power connector. Grasp the RJ-11 connector, and slide it off of the DC / Sound board (there is no retainer nor clips, friction holds it in place). The RJ-11 connector can then be moved to the new part, just sliding into the square cut-out next to the power connector.