@ahiddleston - Thanks for the post. I have already tried updating the wp-admin/upgrade.php file. The first attempt said that it was already up-to-date, so I lowered the db_version using PhpMyAdmin to "22441".
Once I reloaded the wp-admin/upgrade.php page, it offered to update the db. I ran the update and tested again. I still get redirected to a 404 page. I confirmed the db_version was updated to "22442".