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I can't remember the model of the B&K tester I used to use, but it was from the 80's and it had a switch marked "remove shorts". If the indicator light came on for internal shorts, I found they could usually be cured by tapping lightly on the CRT neck with screwdriver handle while pushing the "remove shorts" button.
Quite often during the rejuvenation process there will be something blasted off that ends up shorting something, but it can most always be fixed.
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