When it rains, it pours.  I am afraid I have another serious piano
problem cropping up.

I have a old 1921 Foster in the piano room.  It's not been restored
but still plays.  I often use it to audition our new rolls.

I tuned it last Fall, and the pins were much tighter than average,
and it stayed up to pitch quite nicely so I decided not to rebuild it
for now.  While working on another piano today, I would hear a "pop"
every once in a while, and I could tell the sound was coming from the
old Foster.

Upon examining the unit, I found that several of the top tuning pins
had "slipped" and went flat.  I'm afraid that piano is telling me that
it also needs repairs.

The only thing I could think of is that my furnace dried it out this
winter.  Now _all_ pins are loose.  That is the only thing I can think
of that could cause that dramatic of a change, unless the pinblock has
split open.

If my luck keeps holding out like this, I may be an pinblock expert
before I'm done !  (That's two this year)

Could my shop environment be causing damage to the piano(s)?

Andy Taylor