Easy Repair For Loose Drywall Tape?

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There is a seam in our upstairs ceiling where the drywall tape is peeling up.  I know I can repair this, but I am worried about the cause.  It's just in one little section, maybe two feet long, right above this ceiling is the attic.  Should I be looking into attic humidity levels?  Is there a way to test that?  Our attic has a vent on the side but no roof mounted vent.  I just want to make sure I'm not covering up a potential problem by repairing the dry wall tape.

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