if (preferredMaintenanceWindowDay.isEmpty) {
        preferredMaintenanceWindowDayVal = sqlInstanceSettings.getMaintenanceWindow.getDay.toString
      } else {
        if (validateNonNegativeInteger(preferredMaintenanceWindowDay, PREFERRED_MAINTENANCE_WINDOW_DAY).nonEmpty) {
          return getFailureResultsMap(validationStream.mkString(NEW_LINE))