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How can I fix my noise when I flush the toilet?

When I flush the handle on my upstairs toilet, it makes a strange 'groaning' noise i've checked inside the cistern but to no avail and i've checked my pipework for any leaks but again none found.

Any help would be appreciated.
Jon Ratcliffe, April 2010
put a new washer in the ball valve.

erj, April 2010
diaphragm needs changing.

hi-spec plumbing & heating (essex), April 2010