Last night, my wife was driving her commander home and she said that the radio went completely black, but continued to play music. I don't know if it had any affect on it, but she said she had turned the heat on about 30 seconds before it went out. Anyone know of a fix? I wouldn't think that there is a fuse just for the light. Are the bulbs known to go out? And if so, how hard of a fix is it to replace?