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When the TaskDefinition changes, it triggers a redeployment of the service.  So if you have a new image tag, then you should see the version of the task definition increase in the AWS console, and the service will attempt to deploy the new task.

In my case where I have changes only in one microservice it will replace that one  (it has a new image) plus additional two (which don't have new image), but not all of them so I have hard time to figure out what I'm missing.