I've got a 2004 9-3 sedan, failed mot due to LH side main beam not working (the innermost H7 bulb). Went to replace the bulb, no effect, right-hand side bulb stopped working too. All other lights work and when I flick on high beam, the bulbs illuminate. I've checked fuses, there's power coming to the connector, wiring harness seems to be fine. Is this a ballast/UEC thing?