Geberit toilet repair and maintenance - How to

Showing how to disassemble a Geberit in-wall toilet carrier tank for cleaning, maintenance and repair.
To remove the button panel, push the panel slightly up and then lift it off of the wall on the top.
The lever assembly can be removed easily. Just make sure to stay clear of the two levers, which get pulled up in order to flush.
Don't forget to close the shutoff valve.
Cleaning off all of the seals should fix most of the problems with a constantly running toilet.
During the entire procedure the only tools you might need are pipe wrench and some pliers. I used both of them to disassemble the fill-valve for cleaning.