Take off the cover and carefully look where the water could be entering the ceiling. Since this has just started, do not rule out the seal. With the cover off, re-snug the bolts holding the unit on the roof. Consider putting Eterna-Bond around the base of the unit. If you look at the cover you can tell where the water might be getting into the ceiling. There are not many entry points. This is one leak you may be able to re-create with a garden hose.
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