Ok, a few weeks ago we had a tremendous amount of rain about 6 inches in a day. Water dripped from the ceiling in our bedroom. I went downstairs to check the basement and it was wet under the vent pipe. The next day I went on the roof and found the rain collars pretty much deteriorated and replaced them. I also covered some exposed nail heads. Now another 2" fell yesterday and the ceiling was damp but not dripping. Basement was dry though. I thought that was the leak in the bedroom too but no luck.
I crawled into the attic and saw no stains or wet areas. I am frustrated where to look next. I am thinking of poking a screwdriver through the wet area and go from there.