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it may be ok if its open, but being as old as they are now it is common practice to take them out of circuit for the reasons you noted. I presume back in the day if it was open the assumption was it would be fine, but if you told the tech that oh by the way I plan on using this set for the next 40 years AFTER the repair, I suspect they would take it out of the circuit (and prob call for the guys that ware the white coats to come get you).
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