hi solpepsol,
>> Is the only way to change the login/password the EOC uses to access the DB is to run the EOC configuration wizard?
yes
>> the does the account I run with the wizard, does it need to be admin on the DB or what is the least privilege to allow that to work?
no, the account need not need to be SQL admin on the DB,
apart from creating a new DB, for the rest the "public" security privileges shall be fine.
Cheers,