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Keep in mind, it may not be the gasket. There are a bunch of plastic parts that are under quite heavy loads to keep that flapper up and sealed. To be honest, if you plan on keeping the bus, it would be a good idea to pull the toilet and fix everything at the same time. parts are fairly inexpensive and it will make your life a lot easier. Shut off the water, disconnect the power wires, and water line, remove the 4 nuts and out it comes in less than 5 minutes.