We may have found other answers which could help you.
Click here for Plumbing Repair Leak
How do I remove the fitting for the flush on my hidden cistern toilet?
Replacement of bellows in Grohe air button?
Have I been charged way to much for having a loo mended?
Grohe 42181 toilet filler valve leaking?
grohe toilet cistern leasks ?
how do I change the bellows in the push button unit for the grohe cistern?