You could use a disk block editor to correct the checksum. This would probably lead to other errors, though.
You could also try to isolate the file containing the checksum error and use Detach (see Aminet) to delete it.
But the best way would really be to copy all files to another partition, format the erroneous partition and copy all files back. While you are at it, you should change the file system to PFS3 or SFS.
BTW, next time you decide to use DiskSalv, you should rather use salvage mode first if you want to keep your files. Any repair-in-place operation might delete important files because they are considered corrupt. Salvage might still rescue them, but not after a repair attempt.
Bye,
Thomas
