Pomeo as you are in the know, and I am no longer much with anything, I check just the basics for a bit of a buzz!
: Earths, cables, snap plugs, wiring, fuses etc.plus the mechanical servicing, which is never not to be needed? Did have a engine fault light up with code number which I managed to sort,would enjoy the chip zapping stuff, if I were younger, and wished to course and equip up, but in the meantime, just tinker, and keep stuff that I can see, clean and corrosion free, and then rely on the current experts, who I reckon in the main, are on a roller coaster ride with the electronics. Nice if you are able, and an electronics trained technician.
: Still get a load of wheel alignment faults on AO periodically, so out with the spanners, bit of welding, body and paint. Furthest I got was Sun and Crypton stuff,so I do pray sometimes