We may have found other answers which could help you.
Click here for Cistern Leaking Seal
Grohe push button toilet attached to saniflow ?
Replacement of bellows in Grohe air button?
Grohedal flushing?
Have I been charged way to much for having a loo mended?
Toilet Push Button not flushing properly?
How do I remove the fitting for the flush on my hidden cistern toilet?