Over the past month or so, I have become aware of a noticable red tint on my 43" Toshiba RP. It was very obvious in the black borders when playing widescreen material and was also becoming noticable generally. I spent a couple of hours last night trying to adjust the set, and whilst I had a degree of success, I would like to get a better understanding of what I did. I intend to open the set up and give the mirror and inside a good clean (the set is 3 years old), but have not been brave enough to follow Nathans good advice yet. I loaded up my Avia and checked the gray scale pattern. There was a definite red tint across the range of greys, so summised that it was a gray scale issue rather than a colour decoder problem. I then - just to be sure - entered service mode and tightened up the convergence. Then - again in service mode - I tweaked both red cut-off and red drive until I felt the image was more normal. The Avia checkboard patterns - at different IREs - were useful as they had a definite pink cast to them previously. The image seems much better and I have been able to push the colour setting up by about 7-10% without the flesh tones becoming too red. I have made a note of the default settings for my drive and cut-off settings in case I need to restore them. I am just a little concerned that I do not really understand what the red drive and cut-off adjustments actually do - and their relationship with each other and the other colour adjustments. Does this sound like a sensible thing to have done? Is it possible to get professional ISF calibration for RP's in this country? Any advice or insight appreciated. NB. I do have an electronics background, so was not entirely rummaging around in the dark.