Hello Everyone, and Happy Holidays to all of you!

When one of the black keys on the upper treble section of my 1921
Steinway is played, it makes an extra buzzing sound.  It seems to be
coming from the front right hand side of the pianos inner case.

Do any of you know a good way to track down a funny buzzing sound,
usually occurring when the key is played on the loud side ?

Michael Stehney
Piedmont,  SC