Projector alignment on the Mitsubishi VS-581R + Briteness

[electrotech2000]

I have an old Mitsubishi VS-581 projection TV that still works but the brightness level is low and the images from the 3 projectors are not superimposing properly,

Normally, I wount'nt think that such an old TV like this would be worth trying to fix / make work better, but I am a electronic technician myself
and think that I might have a shot if I can find someone with some experience on these types of units.

Little help?