Serious error in repository--help needed

We seem to have a corrupted revision in our repository. When doing a dump
this particular revision gives the error:
"Checksum mismatch while reading representation:..."
 
We've seen similar errors to this in the past and the "fsfsverify" script
seems to have always fixed the problem but no luck this time. Running that
script leaves this revision unchanged.
 
Can anyone help us recover our repository?
 
Is there some way I can "zero out" that revision and re-commit the changes
that were made in it?
 
Do we have to throw away the last few days of work and restore an earlier
backup and then re-commit everything since then (it'll be very painful for
us to do this).
 
Doug
 
Received on Sat Jul 7 01:55:53 2007