Monitor for problems should be a choice in Preferences, I thought it was in the same Preferences window as the Check for Updates settings.

If you have an amber light on the base station you can launch Airport Utility and click (double click?) the yellow light in the main window, it will take you to a setting to check what the problem is and an option to ignore the problem if you know it really isn't a problem and just a setting somewhere that varies from the norm.