corrupted pg_proc?

I need to repair the old version of Postgresql.

pg_dump does not work, I tried few other things but could not come up
with any workable scenario.

Any help will be greatly appreciated!

Thanks,

Michael.

cdb=# vacuum;

WARNING: Rel pg_proc: TID 31/20: OID IS INVALID. TUPGONE 0.

VACUUM

cdb=# select version();

version

----------------------------------------------------------------------

PostgreSQL 7.3.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.3

(1 row)