I have a 70 XBR2 SXRD that is going to be serviced for the "yellow stain" problem. I previously calibrated my TV and am wondering if I should "center" the settings for things like the color decoder, gamma controls and color temperature before the tech replaces the light engine. What I don't want to have happen is being unable to calibrate the new light engine because the setting range is not large enough set it correctly. As it is now, the red tint control on my TV falls at the 0 setting of the range and actually ends up in just about the right spot. I don't want to need a setting below 0 for it, because obviously it would be impossible to do that.
Also, do you have any tips or recommendations about having my TV serviced? I am not sure what exactly will be involved with replacing the light engine.