HI you brilliant people

I bought my second TDV8 in november. It had then been parked since november because of a failed MOT and the owners declining health. I have sorted out everything and the car is now good again. But the stereo is dead. Land Rover screen and blinking orange light. Gaptool says MOST ring broken.

The bluetooth module has corrosion on the plug and didnt work on my other tdv8. Have most looped it for now. Found out the fuse for the ch ganger in the front was missing. plugged in and now have a red signal to the bluetooth module loop. But every module i plug into after that is dead and stop the signal. If i loop it continius.

It is a possibility that all the modules in the left compartment are dead because of moisture, but seems a but unlikely. 50% dead, sure? 75%? Okey. but everything dead without much trace of moisture at least seems like a cause for investigation. Does anyone know if there is some common fuse or relay for these?

I tried taking module for module from my other car. Still dead. but in that process the cd changer in the back came alive when I plugged it back in. But now dead. Something is starving it of power is my theory?

If everything is dead, how do I code a used amp to fit the car?