audi a6 avant

hello, bought audi recently and i have no idea what my dashboard says about. I changed oil, oil filters, belts. Mechanics reseted service warning at dashboard. After pressing button CHECK near to mmi screen, at dashboard few errors shows up. And this is where its complicated. I will add photos...

I have a 2005 A6 Avant that's having some electrical problems. Heater keeps working and not working sporadically, a few lights on the dash keep appearing and disappearing, the indicator light doesn't flash when indicator is pressed (is stays on as a constant rather that flashing). Someone said...