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How can I fix a Dual Flush Laufen toilet?

How can I fix a Dual Flush Laufen toilet?

We have a Dual Flush Laufen toilet. that have been problematic.
When pressing on the small button the flush is not activated
The big button is activated just in case of long pressing and not in one touch.
Replacement is necessary or it can be mended?
Deedee, November 2014