Prying - was Re: Everett vertical pinblock separation

[Maxpiano]

List -

Many thanks for the advice on dealing with the Everett.

I now face a situation where I cannot see if there is a separation because the
cabinet exterior is glued fast to the top of the pin block.  There are no
rubber buttons hiding screws on this one.  The piano is an otherwise
restorable player (Dayton, 1920s vintage).  However, since it is 400 cents
flat I would like for information's sake to know that the flatness is only due
to neglect and not because of glue joint failure.  In my experience, neglect
rarely accounts for more than 100 cents flat.  The tuning pins do not appear
to be the problem.  

Does anyone have a better solution than taking a chisel to pry that part of
the cabinet loose in order to examine the pinblock-to-back joint?  Or any way
to guess the integrity of the joint without gaining access?

Bill Maxim, RPT