On Sep 23, 10:43*am, Tony Hwang wrote:
cycjec wrote:
Water was leaking from upstairs bathroom into the one below.
We ran the shower/tub water, the sink, the toilet. No leak.
The plumber thinks it is because of defective caulk in the
tub. I hope he is right.

Hi,
Did you use coloring agent when checking?

the best way is tear down the already damaged cieling, it may uncover
more than one issue........