I'd suggest you to bring your bike to another Yamaha dealer as soon as you can, preventing is never enough!
That sounds like a good plan!abs is really useful on these bikes in the current weather we have in the UK, yours will not be functional so get it looked at mate (unless you're somewhere warm)
first thing is to pull the codes, you have a sensor on front, one on rear and a controller with pump, actuators etc, it'll likely need something replaced
you could check it's all still plugged in? maybe the scum bags unplugged it so they could lock it up?