Easiest way to diagnose would be to have the truck in the air on a lift while having someone hold pressure on the brakes. Then start cracking the line loose in different connections, starting from the wheel, until you find where the pressure starts/stops. Then you could see if there is a damaged hose blocking pressure etc. If thee is no pressure anywhere, it might be airlocked in the DSC module, maybe a pressurized system bleed by the dealer while they activate the bleed function of the DSC via GT1 could get it working.

Either way it goes, it may be worth the 1 hour diagnostic fee to have it properly diagnosed by the dealer.

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2003 4.6is