Loo flush question

[Gem1983]

Hi. Plumbing question. My toilet is leaking into the pan at a very slow trickle. Not causing ripples in the pan.

Plumber removed flush valve.. not the basket.. fitted a flush master onto the random basket as the leak is still present. He determined it must be residual water sitting from the flush… even after 2-3 hours??



Can this be right?? Ive got food dye coming tomo to see if residual really is the case. I personally think the basket is letting by. Is that a thing??

 

[rpm]

Surely the plumber should have removed the lime scale before fitting the new seal?
Mine dribbled a little after changing the seal. All I did was push down hard on it and it has been OK ever since. (My flush).
A drop of loo cleaner every so often removes the lime scale.

The limescale under the rim of the toilet pan you mean.