Thank you for all your responses! I have checked the wiring and it seems to be happy from what I could tell. There are 3 PCBs involved - the LED PCB, the LED driver and the mainboard. The LED driver takes a 4-pin connector from the sensor on the LED PCB and sends that down through RS-485 (the same way the mainboard tells the driver what to output on the LED PCB). On the temperature sensor, it seems that the 3 pins for the address (A0, A1, A2) are shorted to the 5v rail along with VDD. I did look into doing a firmware update, however that required having to purchases Martin's proprietary USB to DMX firmware uploader that cost over £100.