[VaSteve]

I was in the bedroom this evening and noticed two faint brown lines had appeared in the ceiling above the "sitting room". Almost as if they were the drywall tape lines.

I have a shingle or two that blew off the roof as we get some pretty significant wind with no trees nearby.

I suspected after all the rain that some water had gotten into the attic. I checked and there didn't appear to be anything. No wet beams where the rain might have wicked down, no gaping hole where the shingles were, no black wood where water had gotten wet repeatedly and no wet looking insulation. (I looked as best as my flashlight and 10 feet away on the a/c ledge would allow).

I have an a/c unit up there with a hose that comes off the top and goes the opposite direction under the insulation. There is another that would drain the drip pan that looks as if it has never seen a drop of water.

House was built in 2004.

I can't think of what would bring out the tapes like that other than water. But I can't find any. Any thoughts? Something I'm missing? The windows have been open on and off with the nice weather.

Thanks