Interesting enough, my first attempt some toilets would be fixed. It would take awhile, but they would get fixed. They kept breaking. I started a new game and this one seemed to have every toilet broken (it was not that way in the first one, but maybe mechanics fixed them before I noticed.)
I have added toilets and that is helping. I am just tired on the notification that toilets or broke and the fact that this seems to still affect guests.
I use toilets to bring in the money to run the zoo so this has definately hurt. I suppose if I have to try a third time then I will see if the toilets get fixed immediately. If not, then I will delete what I can an add new toilets. That way, I can generate needed cash much faster.