2005 Mercedes c220 CDI Avantgrde auto Electrical fault. drives fine

Spares or repairs. Mechanically sound. Starts and drives fine. Mot till May 2024. Only done 3000 miles since last mot. Has slight electrical issue. Rear side lights not working. Front wipers and indicators / heaters are intermittent srs airbag light on. Been told it needs to be plugged into a star machine. Front Sam unit was replaced, cant be More