Auto leveling headlight problem
 

I have a 2003 9-5 that I just bought. Everything works pretty well with this vehicle and I'm happy with it. But on my way home from work, I got an alarm light saying something was wrong with my headlights.

I had just gotten the driver side Bi-xenon bulb replaced by the dealership because the ballast was going on it. After replacement, the system worked fine for about a week.

Tonight, I found out that the driver side auto-level does not function like it should.

Any recomendations on where I should start looking if I were to investigate this myself?

Thanks in advance.