TID 935/15: OID IS INVALID. TUPGONE

[James Thornton]

I'm running PG 7.2.3, and I am getting these notices when running
vacuum analzye:

spower=# vacuum analyze;
NOTICE: Rel sec_browser_properties: TID 935/15: OID IS INVALID.
TUPGONE 0.
NOTICE: Rel sec_browser_properties: TID 935/23: OID IS INVALID.
TUPGONE 0.
NOTICE: Rel sec_browser_properties: TID 935/28: OID IS INVALID.
TUPGONE 0.
NOTICE: Rel sec_browser_properties: TID 935/29: OID IS INVALID.
TUPGONE 0.
NOTICE: Rel sec_browser_properties: TID 935/37: OID IS INVALID.
TUPGONE 0.
NOTICE: Rel sec_browser_properties: TID 935/53: OID IS INVALID.
TUPGONE 0.
NOTICE: Rel sec_browser_properties: TID 935/54: OID IS INVALID.
TUPGONE 0.
VACUUM

Searching the archives has led me to believe that I need to shutdown
postgres and execute:

dd bs=8k skip=935 count=1 <tablefile | od -x

How do I determine the value to use for "tablefile"?

Thanks.