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Yes, I would bite the bullet and replace the remaining caps on that board. As long as the board is out, you might as well rebuild the couplate, unless you can reliably confirm that all its components are good.
Re the spark, I would check any/all other little components in that cage -- resistor, cap, etc. I don't recall offhand what's in there, but there might be something.
Reason I mention that is that I'm working on an RCA 630TS which had a burned resistor underneath the little phenolic board holding the 1B3GT tube in the h-v cage. More or less impossible to spot the spark, even in a dark room, but after I replaced that resistor, the Bzzt went away.
You probably know this, but I would not run the set for long periods until you find and fix the Bzzt source :-)
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