I didn't look at the pictures I suspect the op is just trying his luck at selling it on ......I'm pretty sure I know what needs doing to sort it ........have looked at the pictures and its a bit of a shed by the look of it
OK I know about these faults you can't just change the gearbox on a D3 and expect it to work.
For starters it will need codeing to the car which requires dealer software or the gap tool fully unlocked at its most expensive level.
The replacment...
Gap tool
I use it on all 4 of mine, 1 of my mates d3s and just helped a guy out on his L322 in hard suspension fault.
You only need to vin unlock it to access ccf files etc and advanced features you will never use.
Or to programe keys
We can live in hope....they were out installing a vast amount of new cameras recently in a very poor part of londinium ...Erith. Every single camera was being fitted outside all the local schools because they are poor deprived areas and the car...
Having driven this recently I realise just how superior it is to any other car iv owned. Its election time soon for the London tosspot if we don't get a new 1 and ulez isn't scrapped I honestly think it will have to go......