2001 530 xenon adjustment

I am wondering if anyone knows about the two yellow adjustment screws on top of each of the xenons? I know the the one toward the center of the car adjusts the vertical positioning of the beam. When I turn the adjustment screw that is closest to the fender well, nothing appears to happen. I'm having an incredibly difficult time getting a straight answer from 2 of the local BMW centers. I would appreciate anyone's knowledge.

Thanks