The truck had a laundry list of codes stored in the ECU memory.
Only 2 of the codes (overheat step 1 & overheat step 2) were actually due to a real condition with the truck.
All the other codes were pertaining to ETC, fuel injector, and fuel pressure..........were set by the mechanic who was trying in vain to solve the supposed problem of why the truck would only idle, not having a clue about the ECU putting the engine into "safe mode".
I found plenty of evidence that the truck probably did suffer an overheat event, but the people at the other location are not admitting to anything along that line.
While we have the truck, we are going to do some other much needed repair work as well.