  An assurance case has become an integral component for the certification of
safety-critical systems. While manually defining assurance case patterns can be
not avoided, system-specific instantiations of assurance case patterns are both
costly and time-consuming. It becomes especially complex to maintain an
assurance case for a system when the requirements of the System-Under-Assurance
change, or an assurance claim becomes invalid due to, e.g., degradation of a
systems component, as common when deploying learning-enabled components. In
this paper, we report on our preliminary experience leveraging the tool
integration framework Evidential Tool Bus (ETB) for the construction and
continuous maintenance of an assurance case from a predefined assurance case
pattern. Specifically, we demonstrate the assurance process on an industrial
Automated Valet Parking system from the automotive domain. We present the
formalization of the provided assurance case pattern in the ETB processable
logical specification language of workflows. Our findings show that ETB is able
to create and maintain evidence required for the construction of an assurance
case.
