Invalid byte sequence for encoding "UTF8": 0xedbebf

This is a follow-up on my previous message http://archives.postgresql.org/pgsql-general/2011-06/msg00054.php

I think I have now some understanding of what's causing the problem, but I don't have a good solution, instead more questions.
The release notes for v8.1 at http://www.postgresql.org/docs/current/interactive/release-8-1.html
make a good suggestion on using iconv to convert the plain-text dump file into utf8
On Linux this did not work, the input and output file were identical. The iconv on Solaris refused to open the input file
(probably too big), although it worked with a chunk of it and reported conversion error.

Unless there's no other options I don't want to use sed or break file into pieces, if possible, I would prefer to identify the bad records on the database.
I tried SELECT with everything I could think of: ~*, SIMILAR TO, and the likes of them, but I never got it right.

Is there a way to find the records with the text field containing Unicode bytes "0xedbebf"?
Unfortunately this is a very old version 7.3.10

Thank you.
Michael.

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