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First thing is first on a HV corona/arcing issue (or a restoration for that matter) clean the inside of the HV cage including all parts inside as good as you can without breaking anything(conductive dust and gunk can cause all sorts of arcing/corona). After the cleaning if the issues continue run the set with the HV cage open and or partially dismantled and look for arcing/corona in a dark room with the set on. Once you locate it a picture of the area it is coming from will tell us what it is and how to advise you to fix it.
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