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I had a similar issue. The easiest option was to unscrew the cistern and lift it out. . The pipe can be pulled out from the cistern as its a push fitting, and then you can access the rubber seal by pulling out the semi circular clip. Quite easy. The harder part was reinstalling and reconnecting everything with limited access
 
Where the elbow pipe is short, the easiest option is unscrew and lift out the cistern. It is a push fit into the elbow flush pipe. Then you can remove the rubber seal and clean it (if thats the leak) after removing the plastic clip.
 

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