We have a two bathroom home where it looks to have both bathrooms back to back. Within the past month, every time we would flush the back room toilet, the front one would schreech even after the water has been filled. Within the past week, it would periodically schreech within the hour? I have checked both toilets and both seem to look the same, nothing different anything that was changed was changed at the same time. I have no clue? Would rather do it myself but have no clue where to start??? Suggestions please.