While getting the xmas items out of the attic, the underside of the roof seem damp in spots. it was below 30 last night and we had a frost. The damp patch was on the late morning side. The roof was replaced last year and we had no problems with it (at the time a roof line vent was put in). We also blew in more insulation. Could the damp patch just be morning frost or could it be a new repair job...