see below
Take the flushing mechanism apart and wipe thin smear of vaseline (petroliium jelly) on all moving parts including the push button see what happens. I did this with mine works fine. Or squirt WD 40 over all moving parts while in situe.
bob
October 2012
I can answer this question...
single plush button sticking and not comimg up after plushing?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix toilets.