Might find a user manual from panasonic site … legacy stuff … would be 4 years old … won’t be pretty to look at if the plates have not been replaced. Image will look green or yellow and not a thing you can do about it.
Like trying to fix a car’s brakes … but the pads are gone … and the person does not want to change the pads …
Looks like grayscale is just like all the other panasonic projectors … straight forward. CMS does not work right.