Good morning all. Get to play plumber tonight. Was sitting downstairs last night while my sister in law was using the bathroom upstairs. Heard a noise and at first thought it was just the dog. Well, the dog wasn't around so I go look, and I have water dripping from the bathroom upstairs. Checked the toilets, sinks, and the 2nd shower upstairs. The only thing that caused a leak was the shower. I'm thinking it's just the trap/drain from the tub. I think the easiest way is to cut through the drywall ceiling in the bathroom right below it.