After a bit of advice, before I go to the retailer. I've got a Samsung PS51E550D (51" Plasma) which was replaced a year and 2 months (about 22 months ago) under the CGA as the screen default a fault which caused a vertical line to appear which did not change colours with the rest of the screen. I've just noticed that the replacement (as said, the time since the panel was replaced has been around 22 months) has now got a similar vertical line about a 1/3rd of the way in and its very visible.
I presume that the CGA would still cover it considering the original TV was bought just over 3 years ago? Any one know how the CGA deals with things if the manufacturer no longer makes Plasma TVs anymore, which Samsung don't? I presume the retailer would still have to honour the CGA despite this? All speculation I appreciate, and I intend to contact the retailer, but I am interested to know any other experiences that are similar to mine.