Both fog lights stopped working sometime in the past month. The car is a 1989 325iX with the fog lights integrated in the front panel below the bumper. The interior switch illuminates green, the fuses are OK, and the bulbs are OK. When I test the sockets with a circuit tester, it does not work. Is there another fuse or relay involved? The Bentley manual only explains how to replace the bulbs, and that the fuses are #29 and #30. Any advice is appreciated!