Mitsubishi Forum - Mitsubishi Enthusiast Forums - MMCS Amplifier Data Communication Protocol

Hi, I've been searching the internet for hours trying to find information on the Data communication protocol for the MMCS 800W Amplifier CV-0MW7B51.
Reason being I have one of these Amps from a 2008 Pajero/Shogun and want to install it into my old 1991 Nissan SX project but to be able to do so I need to be able to select the modes on the amp, so I can switch between the different audio inputs of which there is 3 (standard 2ch RCS stereo, H/U 'AND' Digital and 'RSES' Digital).
My plan is to use a PIC microcontroller with 3 buttons for input select in a small box that sends the required data stream to the amplifier.

The wires in question on the amp are on the POWER SUPPLY 18P CONNECTOR(P002) Pins 13 and 14.

Does anyone know of where I can find the Data Protocol or have any information on it, this will save me from having to get hold of an MMCS Head Unit and reverse engineering the data stream, or is there already an input select unit on the market I could use, I cant find one :(

Thanks in advance to anyone who can help.