I think you are on the right track in the PNW. Air sealing was poor in 1980. Culprits are ceiling fixtures and wall plates. Also humans create a lot of moisture in their living space and try to get by with the heat turned down. Sometimes you can see dark patches on the top surface of the insulation where the worst leakage is. But there are other factors and causes.
source https://www.inspectorsjournal.com/topic/19022-moisture-in-attic/?do=findComment&comment=173917
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