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Did you try to adjust the governor on the firewall? On the air compressor head are bolts you can try to check on the unloader.

See if this helps. Go to the air dryer and take off the spin on filter. Reach in where the filter came off there will be a cardboard looking tube. Take this out and then screw the cartridge back on.

The unloader in the air compressor head can get stuck. It's a common problem. Sometimes you can tap on the head and get it to go. Could be a governor issue causing the unloaded fault also. Governor is on engine bay firewall.