A bathtub spout that drips when the faucet handle is closed is typically caused by a worn-out mixing valve cartridge inside the wall that fails to shut off incoming water completely. Alternatively, if a restricted showerhead creates high back-pressure, trapped water can divert downward and trickle out of the tub spout. Verification: Shut off the main water supply, disassemble the handle trim, and replace the worn internal mixing cartridge to restore a tight seal.
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