Help with Ceiling leak
My ceiling has been leaking for a week and I have been having trouble locating a source. I live in a 2 story, 4 yr old house and the leak is in the first floor living room ceiling. The living room is under the master bathroom, so I immediately thought plumbing. When I first noticed the leak, it was just before I had to go out of town for the weekend, so I turned off the water main. When I returned, the leak had stopped, so I called in a plumber. He cut a hole in the ceiling and then couldn't find a leak and suggested it may be a roof leak.
It rained that evening and the leak started back up in the same spot, but water was coming out of the same spot but at a much higher rate. This time, when I turned the water main off, the leaking continued. I went into the attic and couldn't find any leaks and there are no leaks on the second floor ceiling. The next day, after the rain stopped, the leak started to spread in a line and also started to drip out of the fan and vent, as well as random other spots all over the ceiling.
The next morning, I came downstairs to a paint bubble filled with water. In all this time, I've had 2 plumbers and 2 roofers come out. Both plumbers say they can't find a leak and 1 roofer said (without getting on the roof) that he thought it was a plumbing issue. The second roofer thought the roof vents needed to be re-sealed, but never showed up to do the work. In the meantime, I still have a persistent drip and my ceiling continues to be damaged.
Any help will be appreciated. I'm at my wit's end!