This is A.K.A. Boxlight 6000 "Revolution III" LCD projector.

Problem, when no input or when a dark scene is on, there is a blue fuzzy
line running down the center from top to bottom, about 1/20th screen size.

Tech support says it MAY be that there has been a 'shift in the integrator
lens' and that the optics in the light path may need to be adjusted.

They know nothing beyond that, such as how to do it, or how to access it.

If someone knows what the problem actually is, and/or how to correct this,
it would be greatly appreciated. Other than the fuzzy blue line, the
picture is crisp and sharp, and perfectly colored.

Thank you for your time,

Lonny