odd harmonic

[David Graham]

Hi all: Twice this month I have come across pianos which hum a harmonic 2
octaves and a seventh above the fundamental when the key is released. In
both cases it was only one of the three strings which leaked the harmonic,
in both cases an outer string. I checked and re checked the string level.
Any ideas? one was F# 2 on a S&S B, the other was D3 on a S&S D. I have
tuned the D for years- this just showed up. 
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David Graham <dcgrpt@earthlink.net>