Copying into Unicode - Correcting Errors

I need to import a file into a Unicode database.

I am getting an error:

ERROR: Unicode characters greater than or equal to 0x10000 are not
supported
CONTEXT: COPY mailing_list_entry, line 30928, column first_last_name:
"Ver?nica"

The source file came from pg_dump... Is there a way I can easily find rows
like this in the database so I can remove them before I export->import?

It looks like the source database has a lot of garbage in it... I guess I'm
asking if there is an 'easy' way to identify the rows that have issues so I
can deal with them... The table has 400,000 rows so locating them by hand is
not desirable.

I am running on 8.0b5 on MacOS X.

Thanks,
Hunter