Since I'd been chasing electrical fixes I thought it was time to get the back lighting in the centre console working. It had never lit up since I had the car.
Inside the console there is a plug in board with three low wattage bulbs. These must have expired many moons ago. Porsche recommend a replacement board (no doubt at a ridiculous price) to fix this rather than providing new bulbs. Rather than doing this I copied other peoples' approaches of replacing the tiny filament bulbs with LEDs. So I taught myself how to de-solder the old bulbs and solder in 12V resistor LEDs in their place:
So now I have little glowing symbols on the console at night: