Picture is greenish hue and cannot be changed from menu bar

Best way to determine whether the RGB (greyscale) is the problem or if it is a R-Y chroma difference fault, is to turn the colour all the way to minimum - if you get a true B&W picture, the tube is OK. Turn the colour back up - if you see a greenish-blue picture = little or no red, meaning a R-Y defect.

If the greenish tint appears in the colour content of the picture (most noticeable with people's faces), but the greyscale is correct, it is most likely a R-Y problem caused by the jungle IC and/or several electrolytic capacitors plus other components in close proximity to it. This IC may or may not be socketed, either way if it is found to have a partial failure, it will need to be replaced by a competent technician in a fully equipped workshop. The only hurdle there is the potential costs involved (if you submit the TV to a service centre and decide to go ahead with their repair quote).

The quote will allow the workshop to ascertain whether it is an RGB or R-Y chroma issue in the jungle IC. Up to you what you do from here.

The greenish hue cannot be adjusted from the menu. One has to do it from inside.First confirm by turning the color settings to zero using the remote. You should get a clean black and white image with no traces of any color ( inc: green ). If your TV is greenish , the green drive on the base of the picture tube has to be trimmed.
All you need is a screwdriver. There are dangerous voltages inside a TV, some as high as 27,000 volts !!!. Where the color adjustment has to be done there are voltages as high as 110 volts and 8000 volts.If you still want to make the adjustments yourself revert back for instructions