vertical alignment is bothersome, but the camera will still focus accurately, you just have to use vertical lines if the difference is large. If it bothers you, have it fixed. If it is minor, or something you only notice when you move your eye around, live with it.
I've found that with all rangefinders a bit of vertical alignment is inevitable after a while, dunno why. You can have it adjusted, certainly, and you should have it done by someone who knows what they're doing. The regular 5-year service is a good time to do this.