While you wait for answers, we may have found some information which could help you.
Click here for Plumbing Repair Toilet
water does not shut off completly, float sits to low?
I have a leaking plug at the base of my Caroma toilet cistern?
Caroma duoset 6.3 continually leaking into bowl?
How to make water drain from toilet bowl of a Caroma toilet?
Toilet headseal washer replacement?
Where do i get cistern bolts for external mount on a Caroma?