u/BroccoliOnly7376

Found the cause of a leak came from upstairs master shower handle. When I change the selector from main shower head to shower wand, the leaks starts to come down. I changed the cartridge months ago. Could it be that or is it something from the selector handle. Do I now have to worry about major damage within the walls? Will a restoration company have to busy open the shower wall to dry it out completely or can it be done from beneath?

Attached is a picture of plumbing in my garage ceiling. Right above is the master bathroom. This morning the floor was wet and when I checked it out, drops were coming down from the top. My wife was using the shower at the time. I pulled the drywall and it was for sure wet (duh). However I am now trying to see where the leak is coming from and it is now not leaking anywhere. The leak was right where the ceiling joist was. I had my wife turn on both the shower and faucets, flush the toilet, but no more leak. What could it have been??? Thanks for the help.