To fix a shower tub diverter, you can start by turning off the water supply to the shower. Next, remove the diverter handle and the diverter valve. Inspect them for any damage or debris that may be causing the issue. Clean or replace any damaged parts as needed. Reassemble the diverter valve and handle, then turn the water supply back on to test if the issue is resolved. If the problem persists, you may need to replace the diverter valve entirely.
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