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That is what I found with RCA CTC5 Canadian chassis. The Camden installed Mallory's remained all good. But the Canadian Sprague capacitors mounted on the auxillary 25Hz chassis were bad and refused to reform without appreciable leakage.
Recall I spend a few days slowly reforming the capacitors after the TV sets and remained dorment and unused for many years. Most would come up fine but there are a few that will have a higher leakage. The Spragues becan with a leakage of about 1mA and that current leads to heat dissipation which propagates eventual catastrophic failure. I waited to see what would happen to the Spragues and they were warm in operation. If the capacitor is warm, it will go!
So far the 77 year old units in the 721TS still run cool after an hours operation. So my suggestion before even plugging the set in is to do an assessment and dielectric refomation to ensure leakage is 100uA or less and then give them a try.
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