After many happy miles (50,000+) on my 2000 q I've noticed a change in the front headlights. They seem to be moving up. That is to say the entire unit (both) are tilting up from their original position. I can tell not from the beam but from the relationship between the bottom of the headlight unit edge and the body bumper. Is this re-aligned with the adjustment screw under the hood or does that just align the beam inside the unit? Xenon if that makes a diff.

Thanks in advance. Mike