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DAG Database Failover Troubleshooting

We have a rather large environment, 8 node dag with 56 mailbox databases.  Periodically a database will failover and I will get alerted.  I'm having a hard time finding out why the PAM decided to move that database.  I can see in the operational log that it got moved but it doesnt tell me why it moved it or give any error codes that I am seeing.  Where can I look to give me a clue as to why the database got activated on another node?

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