A leaking shower valve by installing a new cartridge.
try replacing o ring on spindle
YES!
Seats in the main valve body are leaking by, allowing water to go to the shower head.
If the tub has a shower as well, the pipe from the faucet to the shower head could be leaking. You might also check the tube that comes OUT and fills the tub. It could be leaking back at the valve when you turn on the water.
If you mean shower valve, screws are for shower valve coverplate.
Behind shower valve handle and trim plate
A drain leak, a leaking shower pan, a leaking shower valve or piping, a leaking bezel or escutchions on the shower valve, bad or missing grout, bad caulking in the corners of the wall, a leaking shower door, water spilled on the floor, or, a drain pipe leak. any one or combination of the listed problems can do it. Look things over take care of what you can see wrong before making a hole in the ceiling. If you think you have fixed the leak repaint the stained area but prime 1st with Kilz or Binz to cover the stain or it will reappear through the paint even if the leak has stopped. If the leak hasn't stopped from taking care of the things you could see then open up a hole to see where it is coming from.
Cut out the drywall in the wall behind the shower. Replace the valve. Patch the drywall.
Put water in it and if it leaks ..... its leaking. A DUUUUUHHHHHHHHH!
Leaking valve cover gasket.Leaking valve cover gasket.
I would suspect that is a Valve Cover gasket leaking.
Replace the valve seal and check the valve guide for wear.
It matters which valve is leaking, how much is leaking and the cause of the leak. It can be fatal but could be repaired depending on the condition of the valve and the particular valve affected. It is not wise the let the child to get overexerted and it is best to have a cardiologist determine all the variables involved with that particular child.
Most likely the intake manifold gasket is leaking.