I left the rug and pad rolled back in the bedroom for about an hour while I "studied" the situation. The carpet was soaked, and stunk. The padding was soaked. The concrete floor was drying. After about an hour or so of study, I dug out a razor knife from one of the drawers in the garage and tried to cut away at the wet carpet. My logic was that the carpeting throughout the house was old, stained, worn and dirty. Before moving in, I fantasized about putting in wood floors, or laminate, like Pergo. Knowing that I would have hidden expenses, I decided to move in and deal with the cosmetics one at a time. I decided at this time, with saturated stinky dirty carpet, that it was not worth saving. If the wet carpet is gone, I can better gauge where the water's coming from. Plus, my daughter should not have to sleep in such a stinky room.
Well, the razor knife was too dull to make a dent in the carpeting, so I went to the kitchen and grabbed the knife that I used to slice the Thanksgiving turkeys. It was indeed sharp. I cut away about 3 feet wide and 8 feet long of wet carpet and padding. The wet carpet and pad was outta there. I hauled it off to the garage to wait for trash day.
I was still scratchin' my head, stewing over this dilemna. Troubleshooting is indeed trouble-some. It was about sundown on a sunday eve. I went back to my belief that it had to be something not tested in the home inspection. Even though I had run several loads of laundry that day, I decided to run "one more". The carpet was up, now, so, any leakage would be apparent. I ran the washing machine, and no leaks. I ran the 'water in the door' on the fridge, ran the ice maker, ran the garbage disposal, ran the showers, the toilets....even the outside faucets. Nuthin'.
I was feelin' a bit stumped.