My toilet is fairly new, it has no build up at all inside. I'm not sure of the brand as it doens't have any names on it. It's a two push button flush and every other time you press the flush (doesn't matter which half) it just stays open. The flapper does not fall back down on it's own and then leak, it just doens't close by itself sometimes. If you jiggle the button it will fall so it doens't seem to be catching on anything either. i don't see a chain inside, it seems to open via a plastic lever type thing. when it does close it seals fine. i don't get why it's sticking open only sometimes? it's driving me mad! Pics attached of the inside. What do you think i need to replace?
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