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Without a doubt, reflow/add solder to basically the power board(s) whichever it uses, can't tell. Most of the 9-181 and 9-160s have erratic issues due to the loose connections. Clean all the snap-in made in Mexico's too. That can always help.
However, on my 1979 25" system 3, i can't recall what board # it was, but it had the standby ckt transformer and zoom all in the same board under a metal cover. Well the power relay was screwed up so I cleaned the contacts with sandpaper and bent them ever so slightly and it brought er back.
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