How to adjust mirrors on projector?

I have two Casa CTL-HM laser projectors.

My problem is that one of the projectors plays everything higher than the other one. How do I go about adjusting the mirrors?

I figured I'd ask the forums before I just go and unscrew things. There's nothing covering the entry XY mirrors, if it helps.

Thanks! :thanks:

The scanners are often set in a clamp. Loosen the clamp and carefully adjust the mirror angle as needed.