I have had problems with bad connections on the AC side but since I replaced all of the indicators with LED's everything is OK.
The DC Main light looks like one of the old original incandescent ones; I agree, probably burned out. The "Cabin Lights" one looks different, but it is strange that they are adjacent.. .. Connections would be highly suspect.. but if you can get a voltmeter on the light wires, you can troubleshoot it pretty easily.