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It’ll probs be for holding the cistern to the pan one on either side. I’d have a guess it’s leaking from the middle and running across.
The min you split it you’ll need to replace the doughnut and sometimes it’s a bastard to get it to reseal.
I also silicon the doughnuts top and bottom as toilets leaking all the bloody time.
konastab01
100% it's definitely leaking although not sure it's from there; that just seems the most likely source