ok there are 2 things that can make this -48 pop up and shut the truck down.
One can be a problem with the directional contactors.
The GE EV100 troubleshooting code list refers to welded tips or slow moving contactors so i'd check the directional contactors very close. Use some electrical cleaner and try cleaning them.
The other thing it mentions is a bad/shorted #3 REC or defective snubber.
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