Taking a Closer Look at the Leak

I removed the baseboard and about 3 inches of the drywall. This is what I found.

It is wettest underneath the vent. Insulation is wet there, whereas it is not on either side of the cutout. The photos below show what's behind that vent.

Installing Drywall

Drywall, aka gypsum board, installation was started on 10/9/2010 and continued on 10/11/2010.

Looking through arch out the front door

Looking from front door through arches into great room

Looking into great room from kitchen

Fireplace will have tile surround, floating wood mantel, and built-in bookshelves on either side

Stairs to left of entry

Downstairs hall leading to bedrooms 4 & 5 on left,
bathroom and furnace room on right

Kitchenette at bottom of stairs

Amy and Chip inspecting the job on Tuesday, the 12th.