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I vote for resoldering the board grounds too. I have fixed plenty of those when working on Maggot-boxes (term of endearment here) in a TV repair shop. Seems to me every ground-return shares those little eyelets on the perimeter of whatever PCB you are having trouble with. Those fingers that reach up through the eyelets from the chassis-stamping can get corroded also, so take the extra time to clean them when you suck-out all the old solder. Use silver-bearing solder if you can find it, always worked well for me.
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