Probably T/M/W is top to bottom.
One could use a 1,5V battery and see which drivers shift when it is applied to the pairs if inputs.
Or maybe even tones or sweeps playing and hooking up a single amp to the wires.
The 9 ports is confusing, I would have expected it like Noah’s ark with 2x2 pairs for T, MR, W… but maybe they also supply a ground?
Do you have a “Digital Multi Meter” (DMM)? On should be able to use ohms/impedance to determine the wire connection idea.