Font error in Acrobat/Reader v7 - ScienceTypeCustomPi

Dear list members,

I work for John Wiley & Sons Ltd in Chichester, UK, a publisher. I've
not posted to this list before - I hope I won't annoy anyone with the
following question.

We've noticed that some of our PDFs are giving an error when opened by
any version 7 Adobe product (Reader and Acrobat) yet they have been
openable by all previous versions. There seems to be a common thread to
the files - the use of fonts called:

ppi028 ScienceTypeCustomPi-No1T
ppi029 ScienceTypeCustomPi-No2T
ppi030 ScienceTypeCustomPi-No3T
ppi031 ScienceTypeCustomPi-No4T
ppi032 ScienceTypeCustomPi-No5T

We've been told that we might be able to "fix" the affected files by
re-distilling in the presence of these fonts, but the suppliers who
created these PDFs back around the year 2000 are no longer around. I
believe that the typesetters may have been using TeX.

I've looked on the web for a source and on my CTAN and TeXLive CDs but
have found none of them - does anyone know where we could get copies of
these fonts?

Many thanks in advance.

Simon Newton
John Wiley & Sons Ltd, Chichester, UK
[This has also been posted to the TeXHax list.]

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