Yamaha instability

[Michael Kurta]

    Hi Don:
    They want an accurate digital hygrometer reading at the time another 
tuning is done, then a retune in 2-4 weeks with measurements of the notes in 
question and a second humidity reading.  All sent to them for evaluation.  I 
think they want to eliminate the question of environmental conditions 
causing the instability.  Thanks for asking.....
    Mike