My driver rear tail light is not working. Checked fuses, bulbs, wiring for tears, all good. Changed rear circuit board that holds the three bulbs, still no tail lights. No power at the pin that brings power to the bulb socket. Checked relay 73, tail light relay, and only two of four sockets have power. Passenger tails lights work. Are there separate circuits for the left and right tail lights off of relay 73? If so, does this point to the fuse box circuit board being defective? Help please. Tks.