My machine came with 4 extra relays - M codes 81-84. I also found that there were another 4 outputs for relays that were unused when i was looking through the ladder logic - M codes 71,73,75,77 (cancelled by M72, M74, M76, M78 respectively). I had to trace the wires for these outputs and installed additional 24 volt relays. The wires were Y539-Y542. These wires were bundled together with a ton of other unused and marked connections using electrical tape and hidden behind other wiring in the wiring loom. The wires go high (24V) when turned on by the correct M code and then are pulled low when turned off. I believe that your machine will likely have the M71-77 outputs. Not sure about the other M codes as it looks like someone added to the ladder for my M81-84 codes (i bought the machine used - it is a 2005)
If you send me a copy of your ladder i can help you trace the wires.