Inside the tank are two bolts holding the tank on to the base. Unscrew these two bolts and carefully lift water quality the tank from the base. Remove tank to the trash.
There are two, one on each side of the toilet, closet bolts which hold the toilet to the floor. If there are caps over the bolts, remove or pop them open. Using a small crescent wrench unscrew the nuts from the bolts. Alternate side to side when unscrewing this will be much more important when reinstalling the water line repair bolts but alternate anyhow.
One other common design that is considered "washerless" was made famous by Delta and copied by several other makers. It uses little "cup" seals that fit over springs recessed in the back of the valve body. The springs press these "seals" against the cartridge and regulate the flow through little tapered openings in the cartridge. If you have one of these and it's dripping, changing these springs and seals will usually correct it. Here's a tip. Once you have the cartridge out of the way, insert a phillips screwdriver into the seal and pop both the seal and spring out. Stick the new ones on the end of the screwdriver to help guide them into place. This is especially helpful if you don't have long slender fingers.
Depending on your repair job you might need a bucket that will fit below the sink trap, as well as some rags and newspaper. Masking tape is useful for labeling and for wrapping around the heads of the wrench to protect your chrome tap handles. Rubber gloves are recommended, particularly when working with the toilet, but there are greases and glues that you may not want on your hands.
If the area around the fan isn't clean and dry, or if dust or any sort of growth has accumulated on the blades or inside the exhaust duct, it may be a warning sign of excess moisture build-up. Clean the water line repair fan and area well. Then double- check that the fan is operating properly.
If you do in fact choose to replace it, there is a good chance that you have an Aqua Magic IV which is no longer produced and has been replaced with the new Aqua Magic V. If you are replacing your toilet and have the Thetford Aqua Magic IV, there are other options such as the Thetford Aqua Magic Style Plus or Thetford Bravura Toilet as well as choices from the Sealand line of toilets. You will have to choose whether you want a hand or foot flush, and whether you want to stay with plastic or upgrade to china. You will also have the choice of adding a water saver. Regardless of which choice you make you will most likely be happy with the quality and dependability of any product available.
Then, you can take your new shower parts home and reinstall them in the inner assembly. It is very important that everything be aligned properly and tightened to prevent leaks. Beware of over tightening, however, since this can also cause problems. Once you are sure everything is installed properly, replace the cover plate and turn the water back on to test your repair work. With a little bit of work, your do-it-yourself shower repair project can be a success. It does not take an expert, just a little effort and know how.