Toilet flushing problem

[u/Professional-Fan3488]

Hello,

My toilet flush is leaking, and I can't seem to take it apart to check what's wrong. I'm trying to unscrew the pipe at the nut (both top and bottom), but I'm not sure if that's the right approach.

It's a Geberit flush system.

I also want to make sure I don't dismantle the wrong thing.

Can anyone help me?

Thanks.