Hi, Looking for a bit of help with a geberit flush valve that has a slow leak. I'm pretty sure it just needs a new seal, but I can't for the life of me work out how to get the flush valve body off to look (and replace the seal). Photo below shows the valve body.. There are no tabs/clips to press in that release it. It would also appear that you need to rotate the body till the tabs line up and then you can pull it off, but because of the width of the cistern it won't rotate fully. Help! Cheers Bill.