Hi Paul, I have now unbolted the stack and removed the Kaiser panel, and I did indeed find the phone module and a grey loose connector there, which seems to fit the voice module. However, there were some wires stuck in front of the connector, in a kind of a loop (see photo). Should I remove these wires, and if so, how? Is this the voice connector? Also, should I try to mount the voice module here behind the stack along with the phone module, or on top of the stack? Or can the voice module replace the existing phone module (which would make the connecting process much easier)?