You would have to purchase an S16 and bring the remaining inputs in through that stage box or you could just purchase an S32 and sell the 32 Channel Copper snake. The X32 Compact only has 16 local inputs. The full size X32 has 32 local inputs.
Sorry but I do not see what revision you are referring to. Lake Controller Software is presently at 6.8.3 and Firmware is at 3.36. If you open the accompanying Read Me file to the LC software it will indicate which level the Firmware is at. I am not sure what you are referring to when you state 1.3.1? The Firmware Updater is a utility of the accompanying LC Software.
With no input terminated and that type of noise on the output I do not think there will be any quick field fix. I suggest you start an RA with service and they can guide you through the process of getting it repaired.