Hi disco my pump also stopped working in the past, to remove mine there is a small screw on the top of the bracket that holds the pump in place (under the toilet roll holder) you can then lift the pump out watching where the hoses go, mine stopped because of gunge in the impeller ,jiggled it around and cleaned the impeller hole ,then all worked , when putting it back together be mindful you do not drop the screw into the tank, also make sure discharge hose is secure to toilet bowl as there should be a washer there to hold the discharge nozzle in place if not correct it turns into a bidet , if necessary look up your toilets spare parts list to see how it’s all connects, we always add a dash of solvable eycluptus to the hopper tank to stop gunge