Where is the governor for the aircompressor for the 923? The safety blows off and the primary and secondary charge to over 150psi. I drained the system to 0 and started truck up but still does it. Could there be a blockage somewhere(rust)? Has ABS but has been disabled (military disabled it) light is on. The secondary system when overcharged doesnt operate at all (wipers, horn, etc) .Whats a good way to fix it and is there schematics on this air system somewhere online? Thanks.