Grohe toilet flush panel?

I have the following panel and wondering if anyone can help me.

http://www.plumbcenter.co.uk/en/plumbing/commercial-plumbing/concealed-cisterns-frames/grohe-skate-air-38506-wc-wall-plate-chrome-plated-69295

Recently I can hear the sound of dripping water behind the flush buttons. I don't see any water leaking in the pan. On flushing the dripping sound disappears. I don't think it's the sound of the cistern filling up because when I wake up in the morning (ie. a good 6 hours since the toilet was used I hear the dripping) can't pin-point how long it takes for the dripping sound to start occurring.

Maybe I need to monitor it more actively but on a small flush this morning before work I still didn't hear anything after 1 hour.


1 - How do you remove the panel as I'm scared I break it?

2 - I live in a flat. Is there a danger if I left it the water will leak to downstairs?

3 - Any ideas what the problem could be?

Many thanks