So if the old board says 24vac and the new card says SEC, which is also 24vac (secondary winding) then it seems like that's the correct place for it. The outlet the furnace plugs into hasn't been changed, so I'm sure the hot and neutral are on the correct sides, but I know how to test for that. Thanks for the heads up.
source https://www.inspectorsjournal.com/topic/17341-overheating-circuit-board/?do=findComment&comment=178556
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