I've had it been there done that off to France in my caravan Friday.
An electric flush is the left hand knob facing the toilet. On the right is the toilet roll holder. Lift the roll holder out and pull the cup it fits in to up and out of the tank top. Now get a stick ready fill the water tank and measure depth with the stick. Then check water lever every 15 minutes. If dropping and carpet wet then big problem the tank may have cracked. If no different then it could be as Nick said. Now for the left hand flush knob. That turned anti clock wise opens the valve in the bottom of the bowl [the valve is on the holding tank. You press the same knob for the electric flush. To remove the waste holding tank YOU MUST MAKE SURE THAT VALVE IS SHUT OR YOU WILL BREAK THE OPERATING LEAVERS. So always ensure before removing waste holding tank that valve is shut [knob turned clockwise]. Outside open toilet holding tank water filler is the top swing out one. To remove the toilet holding tank press down on the wide plastic strip at the bottom of the tank hold it down slide tank a littlle way out watch your fingers, then hold the front handle with right/left hand and gradually ease the tank out grab the top back handle and pull it clear. Keep the tank with the empty tube uppermost. Cart it off to disposal point turn the empty tube to vertical position unscrew the cap put grab the top of tank handle under the tube and the bottom handle tip into the disposal tank/ bowl at the same time press the largish white button to allow air to enter the tank for rapid emptying. rinse job done. put about a pint of water in the tank re-cap and back at the van pour the blue stuff in through the empty tube. The pink stuff goes in the water filler above the holding tank.
Any more info you'll have to be quick I'm gone Friday. Oh! on front right side of toilet water tank is the level indicator suggest you only let it go to half red before emptying.
I can tell you more like how to replace pump if it packs up but you'll have to be quick because I'll be gone Friday and stop using computer Thursday. Back on 26. Want more then send email to robertwhiting76@hotmail.com
Bob
July 2008