Yeah, I made a list of the codes I found (using our Hitachi OBD II reader) and then checked the "real time DTC" area and it showed no active conditions still exist.
The truck had actually returned to normal operation (would throttle up OK) when it arrived here.
I cleared all the codes from memory with the Hitachi and then ran the truck for more than an hour, it ran fine and set no codes in that time.
I am going to replace the engine thermostat and temperature sensor arbitrarily just because I can't get any kind of confirmation that an actual overheat event really took place.
The radiator itself was completely full of coolant when the truck arrived here, and being that full suggests that the coolant had been "topped off" very recently. The coolant recovery reservoir is missing from the truck.
Considering that the coolant recovery reservoir is missing and the end of the recovery hose from the radiator was stuffed up into the hood insulation sort of screams "non mechanic" to me.
I have inspected all the wiring at/near sensors and other connectors and all appear to be sound.
After we finish all the repairs I will try to arrange for the truck to be used in regular service for at least a few days here at our dock before sending it home. That way I still have it held captive and will be able to get daily reports of its behavior and will connect the Hitachi to scan for codes before I turn it loose.