It is always better to put your rig...1999 38' Monaco Windsor...in your signature so people don't have to hunt for it. But in answer to your question, yes, I did have to replace my toilet. The metal mechanism that flushed it rusted out. Before that, I repaired it a couple times.
Here's the article I wrote about it. My rig was a '94 so it's possible there enough similarity that you'll find the article useful:
Replacing toilet...