6.1 to 7.3A upgrade: error upgrading SAM database

[KIRBY2000]

After upgrading to VMS V7.3-2, I am trying to upgrade
from V6.2 to Advanced server V7.3A.
(VMS 7.1-2 to 7.2 then 7.3-2)

@SYS$UPDATEWRK$CONFIG, I receive the following error:
"%PWRK-F-SAMCHECK, error upgrading SAM databases"

(See below for a more complete print out of the error)

I assume that the SAM database is corrupt on VMS V7.1-2
and the upgrade "discovers" the problem.

Is there a procedure to fix the SAM database?

Thanks in advance.

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ERROR DURING SYS$UPGRADEWRK$CONFIG:

Do you want to change the server configuration parameters now? [YES]: NO
The OpenVMS Registry server is already started on this node.

Reading current configuration parameters ...

Upgrading SAM databases...


%PWRK-F-SAMCHECK, error upgrading SAM databases


PWRK-F-CONFIGERR, severe error during configuration.

Error getting this server's role from the existing databases.
Make sure the file server or another utility is not running
You must execute @SYS$UPDATEWRK$CONFIG again.
The Advanced Server configuration is incomplete and cannot continue.
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