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do you have the full set of TM Manuals? they should walk you through step by step for a full system check.

Yep, just open up the air tanks and let it sit, it'll be noisy, but take about 20-30 min for a full "exhaust" if the system is fully charged. After that, IIRC, actually pump the brakes a few times, open and close your e brake and trailer brake knobs. Make sure you have the truck FULLY chocked...

Stuck valve in the system, IIRC. Check starting at the brake pedal and then all valves. I would also recommend a drain of the system (through normal means) and then refill it. Reverse of this can happen in the FMTVs where the brakes won't engage due to water in the system that freezes in cold...