A professional licensed plumber typically charges between $175 and $350 in total labor and service call fees to diagnose and repair a leaking bathtub faucet by replacing a worn mixing cartridge. If the repair requires cutting into finished drywall to replace a severely damaged in-wall brass valve body, total costs can range from $400 to $900. Verification: Test the bathtub faucet after professional servicing to confirm zero water leaks.
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