PSA-2 main board

So, I have a collection of Crown PSA-2 amps (10 and some parts).
Out of the 10 of them only one is working. I have taken the main board out of the working amp and install in each of the 9 amps and each one has worked.
With that being said, I am left with 9 main boards that are non-working.
All have one channel with the IOC light on and voltage on that channel.
All look in good shape, nothing burnt. Does anyone know of any common problems with these boards?
what component is most likely to cause these issues?
Thanks, Rocco.

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