Buzzing Acrosonic

[Mike Masters]

Hello List,
				I have a customer with a 2 year old Baldwin Acrosonic. Not a bad 
piano from what I've seen of it (which is more than I would have liked 
to have seen) The customer calls me every month or two complaining 
about a something-or-other noise that never stays on the same note, 
nor does it stay long enough for me to get there (and I have made next 
day special visits to try to catch it.) 
			She describes the noise as kind of a buzz that is in the back of 
note. I have spent literally hours with us sitting at the piano. It 
has never done it when I've been there.
			I have checked every possible thing that I can think of, can't seem 
to find a buzz or a problem. Ive checked bridges, board, ribs, 
strings, case parts, installed a few screws on the key cover hinge 
that were never installed (14 to be exact.), oh and I've also checked 
for items near the piano that could be excited by certain frequencies. 
Nothing.
			Piano is in good tune. It isn't a voicing problem. No action noise. 
I have just about exhausted my efforts. I am beginning to wonder if it 
isn't the piano at all. 
			If anyone has had any similar experiences or some advise on things 
to look for in the piano or the piano owner, it would all be a big 
help. Frankly, I'm losing money on this one, and also my mind.

			Thanks in advance!

Mike Masters
Masters Piano Service
Lakewood, OH