To fix a shower diverter pull up, you can follow these steps:

1. Turn off the water supply.
2. Unscrew the plate.
3. Tighten the screws behind the faceplate or replace the shower diverter gate with a repair kit.
4. Soak the faucet in vinegar to remove dirt and hard water residue.

If you have a tee, two, or three valve shower diverter, you need to remove the bathtub faucet to find the diverter.