I have recently bought an XG852G which has as its only apparent problem a badly burned Green CRT (half of it is "greyed out"). The other 2 CRTs seem fine. I have found a supplier for replcement Green CRT and have a couple of questions: 1. Can I simply replace the Green or would it be best to replace all 3 at the same time? 2. Any instructions on how to go about the replacement? Or better yet, any link to a web-site that will walk me through it? Thanks in advance!