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Third party services can change without notification as they are usually under the control of external providers. Unexpected changes can clash the integrity of a composition and monitoring approaches have been proposed to detect such changes. Many of these approaches are based on executing all test cases of a regression test set to check whether the behavior of the monitored service remains the same. Such strategy, however, can be very expensive as costs may be associated to the testing activity. In this paper we propose using structural testing information to detect structural changes of monitored services and select only a reduced number of test cases of the regression test set to be executed. We also present three exploratory case studies to evaluate our approach.