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Start at the anode cap as Jon says. Is it clean in that area? Clean off any dust. If it was in a smokers house this can be pretty nasty. Then check the hv lead to make sure it isn't too close to anything else and is well insulated where it comes out of the hv cage. Could also be arcing inside the cage. I'd probably just take the back off and run it in the dark. High humidity could make a marginal insulation fail. I've seen some that were really bad under extreme situations, like sitting in an uninsulated shed during a heavy summer rain.
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Bryan
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