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I was waiting to see what the wizened ones had to say. IMHO it could be any of a number of modules on the CAN which is "bringing down the CAN". Could also be CAN wiring, but the most common fault is a module on the CAN itself, even the overhead control module. I'd even say "especially" the overhead control module, aka the trip computer, we had a number of those fail back in the day, I do remember one failing and causng a problem like this, and the tech rep said to start with trying to disconnect the trip compter, then see if the active CAN codes went away, which they did.
The tech rep did say if disconnecting the trip computer didn't solve the issue, then plug it back in and proceed to the other modules on the CAN and do the same thing, disconnect, check for active CAN codes, plug back in if they were still there, proceed to another one, etc until the one that was shorting out the CAN was found. So this is whay I recommend, again starting with the trip computer Overhead control panel or OCP.
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