Toilet Seat Ideal Standard Ravenna Toilet Seat Code under Toilet Cistern Lid is 22 OR 177 OR H/M834

handle needs to be held down to flush?So our was having a harder time flushing recently, so my dad tried to fix it and now its worse, we have to hold the handle down for about 20 seconds for it to flush, my dad said the flapper wont stay up when its flushing.