You have to check in your manual what connector fires this line of light by the color of the cables,then taking out the connector from board driver check if the pin(this connector have 11 pins) have the 6.5 vac.If this is ok then the problems is in one or more light sockets,you need to track down every light socket,sometimes is a cold solder,and fixing the first in the row with the problem results in the others working