So just to update where I am on this machine.....
4 weeks ago while re-seating connectors, I noticed that the usb connector from the OP panel to the main USB cable that runs to the back of the machine fit very loosely, so I removed the OP panel from my 'parts' machine and swapped it over. The connector fit much more snugly, and the code has not returned.
In the meantime, I installed the questionable OP panel on to my other machine. I had only powered it up a few times and for shorts periods in the last few weeks until today when I was working on it with the idea of getting it back into resale condition. After a couple hours of "on" time and testing...up popped an SC672!
It's one of those rare times I was actually happy to see an error code
because it seems that this confirmed my theory that the issue might just be the connector.
Hopefully it helps save someone some time down the road.
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