Grohe cistern push plate air pipe loose?

My Grohe Fresh 38-805 push plate has not been working properly lately. When unattaching this from the front of the cistern, the thin blue air pipe has loosened from the attachment inside the cistern, but is still attached to the push plate mechanism. Any idea where the blue pipe is attached inside the cisern for it to work? And any idea on how to do this?

JJe Shine
Feb 2014

Shine, February 2014