Hello, my 20ish year old piano which has always worked like a charm is now making an odd harsh sound with playing only in the power bass section of the piano. This is since my nephew had a little too much fun making far too much noise with it this past weekend. I'm not sure if something has been loosened somewhere I might be able to fix. I've made a YouTube video:
https://youtu.be/Hcy3-aJUo-o