Recently my bulb failure light was active which alerted me to the third brake light in my spoiler. I replaced all six bulbs, but the lights still won't work. I've used a voltage tester and found no power at its lead. The lower left and right brake lights do work. I've noticed next to the left brake light assembly a light control box part number 9128814 that regulates 4x tailights and 3x brake lights. Since this little box runs retail $128.00 US I want to be sure I have covered all diagnotics before purchase. Any help would be appreciated !! My Volvo dealer has never seen this control go bad.