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Maybe stuck check valves. You can unscrew one of the air tank drain valves and an a standard air fitting should screw in. Done it before to fill a stubborn truck.

You can unplug the controller and manually inflate the tires they will hold pressure. If the controller is stuck in a mode lower than highway pressure then the overspeed alert will come on at a lower speed corresponding to the tire pressure mode. I have not heard of a controller switching modes...

Check make sure your release valves are clear.

It's not hard to fix

I have all the lmtv ctis parts

With 3 solid lights on the controller it's probably not sending commands to the valve body

The manual does not offer a solution for 3 solid lights. Just looked. One thing you can try is metering out the switch on the end tank see if it closes at 120psi. Take a gauge and see if you have 120psi at the cab valve body. Thats a strange issue.

Sounds like bad wiring or bad ctis controller. When you first power on the truck do the 3 solid lights come on immediately with no flashing lights?

I have been taking apart some ctis valve and wheel assemblies it would seem the majority of the wheel valve stems can accept a schrader valve. You have to take the air hose off first then the adapter piece and then unthread the elbow to expose the valve stem. Some of the wheels have a hose with...

I don't believe you can do that with the lmtv wheels at least not the ones with the large elbow off the valve stem.

If you know which individual wires are bad you can cut and splice to repair. Lots of sharp edges in the lmtv dash it's very possible your harness is rubbed thru somewhere and is still rubbing. The heater hoses can be accessed with the cab open. Maybe you can just flat clamp them off.

All red lights without flashing from initial truck power on is a hardware fault. Bad controller, bad valve body or bad wiring harness. I would swap the controller with a known good one see if any change in symptoms.

No it's just ctis that I know of. 3 separate solenoid actuated valves control air flow in the system. It's very possible you have a bad solenoid and one valve is not opening on command. The system should know something is wrong the pressure sender would give a reading and expect a certain...

I may have one. Don't spray wd40 into it. It likes clean dry air. No hammers either its sensitive. Why don't you make sure all the connections are good. Maybe carefully take it apart make sure there no dust or something in there clogging it up.

The solenoid that opens the valve that sends the regulated low pressure air is probably stuck or not actuating. It's unlikely that someone sabotaged the system. The valve body is a common failure item.

You might have some dirt in the valve or for some reason it isn't sealing as well as it should? Does the tire leak down over time? If the system can fill air but not drop pressure the issue is more than likely the valve body it has 3 separate solenoid valves set to send different air pressure...

It's a mechanical system that works the same as the M939A2 trucks' ctis system. Once there is around 120psi in the air tanks the system will do its initial pressure check. The system will send air to fill, or send low pressure around 12psi to hold the wheel valves open to allow air to dump...