Getting Condo in Ready to Rent Condition

[Simona Potocar]

Hi Folks - I am getting my condo in ready to rent condition and the biggest issue I am facing is with a leaky bathtub.

It's a two story townhome and the bathtub is leaking, therefore my living room ceiling is dripping.  A plumber has come out about 4 times (same plumber, his work is under warranty) and can't seem to find the issue.  He's tightened the trap and redid the caulking twice. He even caulked the toilet right next to it.

I still see water dripping from the ceiling, not a big continuous drip, but after about an hour and a half there's about 2 cm of water in the pan I have sitting out to catch the leak. 

I think it has something to do with the tub surround and the tub possibly not being flush/lined up right? I can't tell visually but I don't know what else it could be.  The other possibility is the waste stack may be the culprit, though I can't see it from the access panel.

I think I may have to have a plumber cut open the ceiling. 

Has anyone ever encountered this issue? Not sure what other details I can provide in this post but will answer any and all questions, I just need help and/or contractor and plumber suggestions for my area (Cleveland, OH)