While you wait for answers, we may have found some information which could help you.
Click here for Plumbing Repair Water Leak
How do I remove the fitting for the flush on my hidden cistern toilet?
Have I been charged way to much for having a loo mended?
grohe toilet cistern leasks ?
GroheEAU2 Dual flush cistern. The large flush button keeps breaking off?
Replacement of bellows in Grohe air button?
Grohe push button toilet attached to saniflow ?