Have you tried Moyer?
http://www.moyerelectronics.com/Depa...-TV-Parts.aspx
Sometimes you can spot an arc if you turn off all the room lights (total darkness) and play the set briefly. That may give you a clue where the problem is occurring.
If a flyback is shorting internally, I don't think coating the outside will help. Wax isn't the greatest insulator, anyway. That's why they quit using it when better materials became available.
Just my $0.02.
Phil Nelson