Hi all,HOw to check if my service light indicator (LCD) is working properly and if there is any DIY fix to it if faulty ?I have used the car for more than 5000km now , but the service light indicator only drop or off 2 lights ....is there any batteries in the SI board need replacing like my previous E30 ?BTW, how to DIY reset the service light indicator ?Also, how do i know if my a/c microfilter need servicing or replacement ?