YAMAHA YVL80 Problem

I have YAMAHA YVL80 Pick & Place machine which has consistent failures of head I/O card (CPU 8344) due to excessive heating of bridge rectifier on it. We have already replaced this card twice within span of just 3 months. Can I have some tips from anybody on troubleshooting to reach the route cause of this frequent failure of I/O card ?? More details can be furnished about troubleshooting done so far.

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