Piano moved in another room - bushings tight!

[John Dorr]

Hello List,

A customer just called and since she lived nearby, I went to see the piano 
right away.  She complained of certain keys so tight that her daughter, the 
player, couldn't push them down.  I inspected and verified the symptom.  The 
problem seems to be that some, 6 total, of the keys' bushings are now 
extraordinarily tight.  So I'm in the process of rebushing them right now.

What I want to know is why?  What you might need to know is that about a week 
or so ago they borrowed my 4-wheel dolly to move the piano to another room 
while carpet was being replaced in its home room.  This problem exhibited 
itself when the piano was moved back.  It was working fine before they moved 
it.

What happened?  Why just "select" keys?  And should I recommend then that I 
re-bush the entire set?

Kinda makes me go, "hmmm."

Thanks in advance