You can’t tell from the picture but the fella in the middle, the shower diverter valve…he’s leaking something fierce.
So take off the chrome cover (you wouldn’t need those if you kept vice grips in the shower), remove the stem…yup…washers are worn, bit corroded. Could just replace the washers and hope for the best but just in case seats are nicked, threads crossed and because it’s easier and safer, will replace it with a new on.
The hole in the tub would be a gusher of water if you turned on the right or left water just now. Did you know all that gunk was behind the thing??? Yuck.
Put in new stem. It works and it’s pretty.
Looks just like it did when we started except it doesn’t leak anymore.