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Make sure the humidity in your work space is under control. May not be as much a problem in OK, but it sure is here.
One thing I used to do in the damp basement where I worked on my stuff was to turn of all the lights and look for sparks or corona tracking, usually purple.
Then try this, use the canned "duster" and shoot any suspected arcing areas.
I just got GC 10-9002A Red insulating varnish, that I used 30+ years ago to re-coat a flyback.
Have not done it lately
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