Yet another TOD code post.....

Yeah I know, did all the searching I could and didn't find the answer I was looking for. My TOD check light started flashing a few days ago. Pulled the codes, 12,13,14,16,21,24. that's a lot. does anyone have experience with this many all at once. I've looked at all the wiring that I could see, all the plugs, u joints are fine, tire pressure is fine. I changed to transfer case oil, it was black and nasty. Any one have any idea where to look next? Are there other hidden wires? Also, I do have the 912s and have the typical rear grinding associated with a lift. The grinding is about a third of what it was before the check light came on.