While you wait for answers, we may have found some information which could help you.
Click here for Push Button Work
How do I remove the fitting for the flush on my hidden cistern toilet?
Grohe seals 14.11.30 4 DAL?
Short burst of water entering cistern ?
Replacement of bellows in Grohe air button?
Toilet Push Button not flushing properly?
how do I change the bellows in the push button unit for the grohe cistern?