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Sounds like the solder joints to the connectors on the CPU board are causing the open circuit. Just like the HVAC/logicon/clock & idiot light cluster on FCs, the solder joints like to crap out on these too. If you're handy with a soldering iron, pull out the CPU, open it up and re-do all the solder joints where the connectors join the circuit board. Pop it back in and see if it solves your problem.
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