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I think it's a combination of valve and seal failures. If any gear oil gets into the valves through leaking axle seals, the valves get gummed-up and won't work right. Air seals at the bearings can fail - the M44A3 has four seals per hub whereas I believe the M939A2 has... two? But the 939A2...

Last I checked, replacement controllers for the truck are pretty expensive. Also, I'm unsure as to how much of the controller's functions are in the box itself rather than the power manifold under the truck - for example, is the Off button turning off the box, power manifold, or both?. I'd...

I'd start with the CTIS troubleshooting instructions in the TMs if you haven't already. TM 9-2320-386-24-1-1 has the unit-level troubleshooting instructions for the CTIS.