The Sony XBR1s don't have color (or colour ;-) wheels so its something else that is well known around here (been there, done that, got the T-shirt ;-)
There is an XBR1 Owner's thread close by in the threads list. Start at the end and them work backwards. Or, do a search for green stuff and take a day off work to read the results.
Start here... http://www.avsforum.com/avs-vb/showt...&#post10826760
To buy a new XBR1 and take your chances is one thing. Many people, myself included, have experienced green problems and got out of the TV after repairs and replacements. Many others have not had a problem (I didn't to start with). But to start with a green set is not recommended as it will need to have its light engine (aka optical block) replaced. This could be done under Sony's warranty, or even get the set replaced, if you are willing to go through the "process" and hassle.
How much is the seller asking for that 60XBR1 and is it from a retail store or a private individual (who could be unloading it because of the green problem).