My lovely 57" Sony RPTV (7 years old) is throwing some convergence issue. For the last week or so I see blue separated by at least 1/2 to 1 inch. I can see that clearly when there is a white text (appears as blue and yellow). First I did auto flash and then entered into manual convergence mode to fix it. Though I could fix some + in the middle of the screen, towards the corners it was pretty bad. I opened up the front panel and fixed the three focus knobs and it almost got corrected. In the process somewhere I added little bit red to the overall picture. I was planning to call some one in to calibrate the TV. I ran it for about 20 hours in the last week or so and again since last night, convergence has gone bad. Any idea how I could fix this. If I have to call an engineer, I am willing to do that. It's just that I like the picture quality in this when properly calibrated, and wouldn't mind spending to fix this. If guided, I can enter into the service menu too, but I do not have any tools/hardware to do repairs. Thanks in advance.