Oh that is a releif. I must have read that wrong. First thing to check is to run the ski on the hose and see if there are any leaks. Correct if any. If none found, strap the back of seadoo to the trailer and back down into the water. Lift the seat and look for leaks. if none, start the engine and look for more leaks.
Then move onto the bailer system (two black rectangle boxes at the bottom of the hull. Gently lift the metal tab and slide them out. The undersides should have lots of little holes. Make sure they are clean (wash them with soap and water and poke the holes with a tooth pick or something. Make sure the lines go up to the top of the ski (near the rear grab handle) and then go back down and out towards the jet pump. If they are just lying in the hull, water will end up coming in via jet pump. Another thing to check/replace is to remove the jet steering pump nozzle and replace the two little O-rings at the top of the jet pump.
Other areas to look for are around the carbon seal (remove the grey cover @ rear of engine) (ski must be in the water) and also the steering and reverse cables as they come through the hull can leak.
Or on occasion, the hull seem may leak. If it leaks through the hull. Go to a marine store (west marine, etc) and buy a tube of Sikaflex. It is the best sealant and will stick to anything. I always joke it could hold water together!