We may have found other answers which could help you.
Click here for Dual Flush Toilet Grohe
GroheEAU2 Dual flush cistern. The large flush button keeps breaking off?
Grohedal flushing?
Replacement of bellows in Grohe air button?
Have I been charged way to much for having a loo mended?
How do I remove the fitting for the flush on my hidden cistern toilet?
how do I change the bellows in the push button unit for the grohe cistern?