<human>:  How do I repair a running toilet?
<bot>: To repair a running toilet, you'll need to first identify the cause of the issue. Common causes of a running toilet include a defective flush valve, a broken toilet flapper, a corroded overflow pipe, or a clogged flush valve vent pipe. Once you have determined the cause, you can then take the necessary steps to repair the toilet, such as replacing the valve, flapper, or pipes. If the problem is a clogged flush valve vent pipe, you may need to use a wire brush to remove any blockage before replacing the pipe.