Upgrade to 4.0.3 - crash symptoms of a motor stop - how to look at motor drive from Logs

ArduCopter Copter 4.0
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Well flown 500mm quad not used over winter. Upgrade to 4.0.3. Flew a few times, (50 mintues), then it crashed during slow climb in loiter. Symptoms of a motor stop. All still seems to work OK after landing gear repair. I can see a tumbling motion in the log. How do I look at motor drive from the logs? Anglian

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RCOU.

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