Calibrating Color Temperature on Production Monitor

I just bought a used Sony PVM-14L5 monitor, and noticed that the white balance is slightly off. Do you guys have any advice on calibrating the white balance on this monitor?

I'm aware of how to calibrate using the color bars and blue gun, but even after doing this, I notice that the color bars are slightly green when using the D65 color temperature setting. I was able to manually adjust the gain and bias setting to get pretty good color using the old eyeball method. But it's definitely not right on. So is there some correct procedure for doing this? Or some tools that will help, or maybe even a service that can do this for you? I don't want to spend too much more money, but it would be nice to have a monitor that actually displays the correct colors.

In an earlier thread, I saw Tony Salgado mention that he uses a monitor probe to measure color temperature. If you're reading this, Tony, what model do you use?

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