Sorry this is so late. I had to beat one of the wheels off of my truck with a sledgehammer!
This is the damnedest thread that I've ever read. I have code 33 on that truck that I was just working on so this was of some interest to me.
It's very long and there doesn't seem to be a clear answer but you will have a good understanding of the system by the time you're finished.
Hopefully our repair of 33 goes smoother than Aliens did.
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