Hi I have a 82 240d and the lights on the dash board wont work. When I turn on the switch, the light will come on that lights up the transmission but the dash stays dark. Because none of the lights come on in the dash, I assume that a circut is broken, and I was wondering how I would troubleshoot it. Also I would like to know how to replace the lights just in case it turns out that they all burnt out. Thanks.