The flapper is warped.
![Flapper Assembly](https://do5nkkzntcenb.cloudfront.net/Project/Sites/Lixil/US/ASUS/care-and-repair/flapper-assembly.gif)
![Original Equipment Flapper Assembly](https://do5nkkzntcenb.cloudfront.net/Project/Sites/Lixil/US/ASUS/care-and-repair/original-equipment-flapper-assembly.gif)
- Take the lid off the top of the tank.
- Is the chain a link or a beaded chain?
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