We may have found other answers which could help you.
Click here for Cistern Toilet Flush
Replacement of bellows in Grohe air button?
GroheEAU2 Dual flush cistern. The large flush button keeps breaking off?
how do I change the bellows in the push button unit for the grohe cistern?
Short burst of water entering cistern ?
Toilet Push Button not flushing properly?
How do I remove the fitting for the flush on my hidden cistern toilet?