CFP-DO-401 status indicator problem

Hello
We use compact field point controller for one of our hydraulic test stands.
And cFP-DO-401 is configured for sequence of boolean operations for all the 16 channels.
The problem is during testing, status indicators are turned off but internally the relay still on , so operation gets failed.
When i checked for cause, some of transistors in the cFP-DO-401 got short circuited.
I want to know what might be the root cause of the failure or problem.
Thanks
Regards
Kirit

I would just like to add that the correct URL to the KnowledgeBase link that Dirk posted is here:
KB 4G2EC3K8: Why Does my [c]FP-DO-400/401 Have Channels Stuck in the On Position?
Kameralina
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